20 Best Car Battery Cut Off Switch [2022]

Are you looking for the best Car Battery Cut Off Switch? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Car Battery Cut Off Switch.

We Recommended:

# Preview Product
1 Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut... Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect...
2 Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat... Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat...
3 Black Brass Battery Isolator ON Off Kill Switches Car Race Rally Switches for Motorcycles Cars Boats... Black Brass Battery Isolator ON Off Kill Switches Car Race Rally Switches for Motorcycles Cars...
4 Top Post Battery Terminal Knife Disconnect Switch - Isolator Master Power Cut-Off Negative Post for... Top Post Battery Terminal Knife Disconnect Switch - Isolator Master Power Cut-Off Negative Post...
5 Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle,... Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car,...
6 Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car, Vehicle,... Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car,...
7 Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut... Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut...
8 Ampper Top Post Battery Disconnect Switch, Brass Battery Master Switch Isolator for Power Disconnect... Ampper Top Post Battery Disconnect Switch, Brass Battery Master Switch Isolator for Power...
9 KTNNKG DC12V Remote Battery Disconnect Switch Auto On Off Kill Switch for Car, 200A Electromagnetic... KTNNKG DC12V Remote Battery Disconnect Switch Auto On Off Kill Switch for Car, 200A...
10 Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine Car... Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine...
11 Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut... Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect...
12 Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor Knife... Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor...
13 GOGONFLY Battery Switch 12-48V Battery Power Cut Master Switch Disconnect Isolator Cut Off Switch... GOGONFLY Battery Switch 12-48V Battery Power Cut Master Switch Disconnect Isolator Cut Off Switch...
14 Audewdirect Battery Switch 12-48v Waterproof Battery Switch 12v Marine Battery Power Cut On/Off... Audewdirect Battery Switch 12-48v Waterproof Battery Switch 12v Marine Battery Power Cut On/Off...
15 Nilight - 90015A Battery Switch 12-48V Waterproof Heavy Duty Battery Power Cut Master Switch... Nilight - 90015A Battery Switch 12-48V Waterproof Heavy Duty Battery Power Cut Master Switch...
16 Battery Switch, 12V 24V 48V Battery Disconnect Master Cutoff Switch for Marine Boat RV ATV UTV... Battery Switch, 12V 24V 48V Battery Disconnect Master Cutoff Switch for Marine Boat RV ATV UTV...
17 Big Autoparts Battery Quick Disconnect Switch 12v Battery Cut Off Switch for Car RV PV Boat Truck... Big Autoparts Battery Quick Disconnect Switch 12v Battery Cut Off Switch for Car RV PV Boat Truck...
18 Battery Disconnect Switch,12-48V Battery Cut Off Switch for Car, Vehicle, RV and Boat,Automotive... Battery Disconnect Switch,12-48V Battery Cut Off Switch for Car, Vehicle, RV and...
19 WATERWICH 12V Car Wireless Remote Control Battery Disconnect Switch Cut/Shut Off Marine Battery... WATERWICH 12V Car Wireless Remote Control Battery Disconnect Switch Cut/Shut Off Marine Battery...
20 KTNNKG Remote Battery Disconnect Switch Auto On Off Kill Switch for Car - DC12V, 180A,Silver... KTNNKG Remote Battery Disconnect Switch Auto On Off Kill Switch for Car - DC12V, 180A,Silver...
Bestseller No. 1
Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut...
  • Compatible: used for top post terminal, 15-17 mm cone battery negative post only, DC 12 V system, rated current: 125 A, On/Off 2 position.
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • Heavy Duty: solid made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for Car, Vehicle, RV and Boat batteries which have a standard 15-17 mm cone top post terminal, also used for electrical equipment.
Bestseller No. 2
Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat...
  • 【COMPATIABLE】This knife-blade battery disconnect switch is suitable for TOP POST TERMINAL, battery NEGATIVE post only. Maximum Current: 750A,...
  • 【HIGH QUALITY & HEAVY DUTY 】This top post battery disconnect switch is made of brass material, corrosion resistance, conductive performance is...
  • 【EASY TO INSTALL】This battery doctor knife switch for top post batteries can be adjusted into a vertical knife switch through the bottom of the...
  • 【SAVE ELECTRYCITY】This knife blade master switch is used for the battery to isolate and secure the electrical system, eliminate any power draw...
  • 100% Customer satisfaction is our constant pursuit, we only provide good quality products for every buyer friend.If you have any problem during the...
SaleBestseller No. 3
Black Brass Battery Isolator ON Off Kill Switches Car Race Rally Switches for Motorcycles Cars Boats...
  • Continuous Rating:100Amps 32VDC Max. Intermittent Rating:150 Amps
  • Insulation Resistance:DC 500V 100M ohm Min; Dielectric Strength:AC 1000V 1 minute, DC 2000V 1 minute
  • Easy to take and install. ON-OFF Battery Switches Universal for cars, off road vehicle, truck, motorcycle, boat and so on
  • Power switches leakage switches protection switch car modification battery switch which is easy to install
  • One year warranty. Your satisfaction is our priority, any questions about our item, feel free to contact us
Bestseller No. 4
Top Post Battery Terminal Knife Disconnect Switch - Isolator Master Power Cut-Off Negative Post for...
  • Top Post Battery Knife Disconnect Switch - Dimensions 3.6 x 2.7 x 1.9 inches - Batteries that are empty and not charged for a long time will shorten...
  • Great for Cars, Trucks. Campers, RV. ATV, UTV & Boats - This battery knife disconnect switch turns on and off by just lifting the lever up or down and...
  • On/Off 2 Position Switch - Made of Heavy duty solid brass that is rust and corrosion resistant, this vertical blade type knife switch can be installed...
  • Premium Fit, Quality, Finish - This battery knife quick disconnect switch comes with a nut and bolt for a hassle free installation to your battery....
  • Lifetime Warranty - This top post battery terminal negative side disconnect switch comes complete with a lifetime warranty. If the part ever fail on...
Bestseller No. 5
Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle,...
  • Heavy Duty: ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short of circuits, equiped with 4 sets of...
  • Operation: On/Off 2 positions, 275 A continuous at DC 12V, 455 A intermittent at DC 12V, 1250 A momentary at DC 12V.
  • Compatible: used for DC 12 - 48 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.
  • Purpose: eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
  • Copper terminal stud size: 3/8" (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment's switch.
Bestseller No. 6
Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car, Vehicle,...
  • Heavy Duty: all aluminium housing, durable made for safety use. Mounts in 3/4" hole, equiped with a face plate.
  • Operation: On/Off 2 positions, 200 A continuous at DC 12V, 400 A momentary at DC 12V.
  • Compatible: used for DC 12 - 24 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.
  • Purpose: eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
  • Copper terminal stud size: 3/8" (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment's switch.
Bestseller No. 7
Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut...
  • Compatible: used for top post terminal, 15-17 mm cone / tapering battery NEGATIVE post only, DC 12V-24V system, 200A continuous and 600A momentary at...
  • Convenience: vertical knife blade type, easy to install & simple to use. Lift the knife, then power will cut.
  • Heavy Duty: solid brass made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for Car, Vehicle, RV and Boat batteries which have a standard 15-17 mm cone top post terminal, also used for electrical equipment.
Bestseller No. 8
Ampper Top Post Battery Disconnect Switch, Brass Battery Master Switch Isolator for Power Disconnect...
  • Compatible: used for top post terminal, 15-17 mm cone battery negative post only, DC 12 V system, rated current: 125 A, On/Off 2 position.
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • High Quality: made of BRASS with cover for strength increase, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for Car, Vehicle, RV and Boat batteries which have a standard 15-17 mm cone top post terminal, also used for electrical equipment.
Bestseller No. 9
KTNNKG DC12V Remote Battery Disconnect Switch Auto On Off Kill Switch for Car, 200A Electromagnetic...
  • Remote Car Battery Disconnect Switch System - kill your car power system with a remote controller now.
  • Handy easy & simple - this Remote Control Electromagnetic Battery Switch allows you to move the trigger from under the hood to your hand
  • Turn on the battery before you start the engine (160 feet remote distance)
  • Do not turn off the battery when your engine is working
  • This remote battery switch is only for battery on / off, it can't start your engine
Bestseller No. 10
Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine Car...
  • Operation: used for DC 12-24 V systems, On/Off 2 position, rated current: 100A (12V ), Max. withstanding current: 150A (12V ).
  • Heavy Duty: ABS plastic and solid brass nuts / washers, rust and corrosion resistant, durable made for safety use.
  • Convenience: easy to install & simple to use, 2 removable keys, waterproof cover for key hole.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Size: 2 brass terminals: 3/8", 2 mounting holes: 3/16". Used for Car, Vehicle, RV and Boat, also electrical equipment's switch.
Bestseller No. 11
Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut...
  • Compatible: with a long bolt, used for side post terminal, battery negative post 3/8" hole only, DC 12 V system, rated current: 125 A, On/Off 2...
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • Heavy Duty: solid made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment.
Bestseller No. 12
Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor Knife...
  • 【COMPATIBLE】This knife blade battery disconnect switch works well for RVs, marine, cars, boats or UTV- all standard car electric system as long as...
  • 【TOP MOUNT】Fit for top post terminal with 15-17mm cone, DC 12V-24V system, 250A continuous and 750A crank at DC 12V, on/off 2 position, operate...
  • 【HIGH-QUALITY】Our battery kill switch is made of solid brass and copper. It features superior performance and good conductivity. It also can be...
  • 【EASY TO USE】Knife blade type, easy to install & simple to use. When you are not using the car or it is stored for long periods, just simply raise...
  • 【INSTALLATION】 Firstly, disconnect the battery cables from the battery, always disconnect the negative cable first followed by the positive cable....
Bestseller No. 13
GOGONFLY Battery Switch 12-48V Battery Power Cut Master Switch Disconnect Isolator Cut Off Switch...
  • STURDY & FULLY ENCLOSED SHUT OFF SWITCH: The Heavy Duty Cut Off Switch is made of ABS plastic housing and copper tin plating inner stud. Fully...
  • COMPATIBILITY & SAFETY: This Battery Kill Switch Used for DC 12 - 48V systems to isolate and secure the electrical system; eliminate any power draw...
  • EASY TO OPERATE: On/Off 2 position, Suitable for various 12 V/24 V/48 V systems. Rating: 275A DC Continuous (1hr), 455A DC Intermittent (5 min), 1250A...
  • WIDELY APPLICATION: Battery isolator switch is universal used for RV, Marine, Car, Boat, Camper, Travel Trailer, Truck, ATV, UTV battery and other...
  • PACKAGE INCLUDE: Equiped with 1* Battery Switch, 4 Pcs Mounting Bolts, 4 Pcs 2*3/8 Copper Ring Terminals, 4 Pcs Heat Shrink Tubings and a hex wrench,...
Bestseller No. 14
Audewdirect Battery Switch 12-48v Waterproof Battery Switch 12v Marine Battery Power Cut On/Off...
  • 【Safety】 This marine battery switch safely disconnects the battery and eliminates any power draw from the battery when the vehicle or boat is not...
  • 【Voltage】 The rated current of this main battery switch waterproof is 275 amps continuously at 12V DC and 1250 amps instantly.
  • 【Wide Range of Use】 The marine battery switch 12-48v is suitable for automotive electronics, electrical products and various 12V/24V cars, boats,...
  • 【Easy to Use】 Our battery disconnect switch is easy to install and operate. 2 positions for on/off, 2 mounting screws (3/8'' diameter (10mm)).
  • 【Simple Structure】 Compact size, ABS housing, brass terminals, rugged Removable back cover isolates rear terminals for short circuit.
Bestseller No. 15
Nilight - 90015A Battery Switch 12-48V Waterproof Heavy Duty Battery Power Cut Master Switch...
  • Heavy Duty: ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short of circuits, equipped with 4 sets of...
  • Operation: On/Off 2 positions, 275 A continuous at DC 12V, 455 A intermittent at DC 12V, 1250 A momentary at DC 12V.
  • Compatible: used for DC 12 - 48V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.Its...
  • Widely used for car, marine boat, RV, camper, travel trailer, truck, ATV, UTV, battery banks and other devices.
  • Package include:1x On/Off battery switch,4 bolts incuded.
SaleBestseller No. 16
Battery Switch, 12V 24V 48V Battery Disconnect Master Cutoff Switch for Marine Boat RV ATV UTV...
  • 【EASY OPERATION】Rating: 275A DC Continuous (1hr), 455A DC Intermittent (5 min), 1250A DC Cranking (10 sec); Stud Size: 2x3/8" (10mm); Switch on =...
  • 【DURABLE MATERIAL】This battery master switch is made of durable plastic housing, tinned copper studs and nuts. Come with 4 stainless steel...
  • 【COMPATIBLE】This battery disconnect switch is used for DC 12 - 48V systems to isolate and secure the electrical system, can stand alone or be...
  • 【NO MORE BATTERY DRAIN】This battery isolator switch provides a reliable way to shut down electrical power during maintenance and protect batteries...
  • 【WIDE APPLICATION】This battery kill switch is widely used for Car, Marine, Boat, RV, Camper, Travel Trailer, Truck, ATV, UTV, Battery banks and...
SaleBestseller No. 17
Big Autoparts Battery Quick Disconnect Switch 12v Battery Cut Off Switch for Car RV PV Boat Truck...
  • ❤Material: Heavy duty Brass alloy. For 6V, 12V and 24V battery systems
  • ❤Convenient Safety - Help isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • ❤High Standard - Battery cut off switch made of heavy duty Brass alloy.Durable zinc alloy terminal.
  • ❤Easy Installation - Battery operated switch to engage power just hand tighten the green knob,Slightly loosen the green knob to disconnect all...
  • ❤Helpful Choice - This battery cutoff switch rust and corrosion resistant.Extends the life of your vehicle's battery.
Bestseller No. 18
Battery Disconnect Switch,12-48V Battery Cut Off Switch for Car, Vehicle, RV and Boat,Automotive...
  • Operation:Switch on = Power; Switch off = No power.275 A continuous at DC 12V, 455 A intermittent at DC 12V, 1250 A momentary at DC 12V.
  • Heavy Duty: This battery disconnect switch is made of ABS plastic housing, tinned copper studs and nuts.Come with 4 stainless steel mounting screws...
  • Safety Protection:Battery isolator switch comes with CE certified,can disconnects the battery safely, protect batteries from excessive drain when...
  • Great Compatibility:This battery quick disconnect is used for DC 12 - 48V systems to isolate and secure the electrical system, can stand alone or be...
  • Wide Application:used for car, vehicle, Rv and boat, also electrical equipment's switch. but also electrical equipment's switch, such as flashing...
SaleBestseller No. 19
WATERWICH 12V Car Wireless Remote Control Battery Disconnect Switch Cut/Shut Off Marine Battery...
  • 1.This is a More Convenient Car Battery Disconnect Switch System that can remotely master kill your car power system,A Proper maintenance will extend...
  • 2.With Silver Contact Surface, Current Amperage is Larger and More Durable,Rated Current180A Main Switch Silver Contact Surface,Universal for DC 12V...
  • 3.NOTE:The manual switch should be in the off state before the remote control can be used,The manual switch use it to protect battary safety when the...
  • 4.Remote operation,Comparing to tranditional battery switch, this Remote Control Electromagnetic Battery Switch Disconnect allows you to move the...
  • 5.Come with 160 Feet New Style Scrub Remote Control.You can even control it in your house,One button control on your dash for the whole car power...
Bestseller No. 20
KTNNKG Remote Battery Disconnect Switch Auto On Off Kill Switch for Car - DC12V, 180A,Silver...
  • Remote Car Battery Disconnect Switch System - When you leave the car for long time , the battery is still working,kill your car power system with a...
  • Handy easy & simple - this Remote Control Electromagnetic Battery Switch Disconnect allows you to move the trigger from under the hood to your hand
  • Turn on the battery before you start the engine (160 feet remote distance).Do not turn off the battery when your engine is working
  • Idea for different vehicle - 12V relay match 12V Electromagnetic ,24V relay match 24V Electromagnetic
  • This remote battery switch is only for battery on / off, it can't start your engine

Having trouble finding a great Car Battery Cut Off Switch?

This problem is well understood by us because we have gone through the entire Car Battery Cut Off Switch research process ourselves, which is why we have put together a comprehensive list of the best Car Battery Cut Off Switchs available in the market today.

After hours of searching and using all the models on the market, we have found the best Car Battery Cut Off Switch for 2022. See our ranking below!

How Do You Buy The Best Car Battery Cut Off Switch?

Do you get stressed out thinking about shopping for a great Car Battery Cut Off Switch? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Car Battery Cut Off Switch, which is why we have assembled a comprehensive list of the greatest Car Battery Cut Off Switch available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Car Battery Cut Off Switch that you consider buying. Your questions might include the following:

  • Is it worth buying an Car Battery Cut Off Switch?
  • What benefits are there with buying an Car Battery Cut Off Switch?
  • What factors deserve consideration when shopping for an effective Car Battery Cut Off Switch?
  • Why is it crucial to invest in any Car Battery Cut Off Switch, much less the best one?
  • Which Car Battery Cut Off Switch are good in the current market?
  • Where can you find information like this about Car Battery Cut Off Switch?

We’re convinced that you likely have far more questions than just these regarding Car Battery Cut Off Switch, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Car Battery Cut Off Switch, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Car Battery Cut Off Switch. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Car Battery Cut Off Switch buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Car Battery Cut Off Switch currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Car Battery Cut Off Switch has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Car Battery Cut Off Switch?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Car Battery Cut Off Switch.
  5. Customer Ratings: Number ratings grade Car Battery Cut Off Switch objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Car Battery Cut Off Switch.
  7. Product Quality: You don’t always get what you pay for with an Car Battery Cut Off Switch, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Car Battery Cut Off Switch is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Car Battery Cut Off Switch information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Car Battery Cut Off Switch is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

Related Post:

FAQ:

Q: How do you disconnect a battery in a car?

A: Disconnect the battery then unscrew the brackets holding it in its tray. Car batteries are heavy so lift the battery up, out of its tray with care. Use diluted baking soda mixture with old toothbrush to brush the tray and connectors. Do not put the new battery before they dry.

Q: Can I Disconnect my battery while the car is running?

A: In theory, if your alternator is working and providing power to the car while charging your battery, then once the car is started, disconnecting the battery shouldn’t cause the engine to stop running.

Q: How to disconnect auto battery?

A: 1. Take the necessary precautions before you try to disconnect your battery. Besides holding a potentially lethal electrical charge, batteries …Turn off the ignition.Wear safety goggles and gloves to protect your eyes and hands. {“smallUrl”:”https://www.wikihow.com/images/thumb/8/88/Disconnect-a-Car-Battery-Step-2-Version-7.jpg/v4-460px-Disconnect-a-Car-Battery … 3. Determine what size socket you need to loosen the nut on the negative terminal. Always work on the negative terminal before the positive when …

Q: What is a battery kill switch?

A: A Battery Kill Switch For Security And Safety. A kill switch will shut down a running engine without damaging the alternator, while a master/disconnect switch may or may not kill the engine, its job being to isolate the battery from the rest of the electrical system while the engine is not running.