This video is neither as dangerous nor as insane as the title indicates, if only because you're only using the chainsaw's motor and not the actual chain itself. Do not take a chainsaw to your engine without first removing the chain. It would be bad.

With the chain, frame and sprocket removed from the chainsaw and an old fan belt, piece of rope, or even your shoelaces attached to the saw, you can remove the fan belt from your car's alternator pulley. Slot the fan belt attached to the chainsaw onto the alternator pulley, and turn the saw on. The spinning alternator can now generate a current, recharging your battery, much like it would if your car's engine were actually running.

Take a look at the video below for the full rundown on how to recharge your car's battery like MacGyver.


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    • 1 Second Ago
  • 26 Comments
      brian peters
      • 1 Year Ago
      all you naysayers and internet tough guys can just piss off. This shows imagination and ingenuity. Think I'll go subscribe to his channel.
      Porsche4life
      • 1 Year Ago
      He's just trying to show you a way to charge up your battery if your ever stranded somewhere and you got what it takes to get this done. Thank you
      BJMcGee
      • 1 Year Ago
      This is one of the downsides of the mass adoption of automatic transmissions. On most of the cars I have ever owned, I point the car down hill, pop the clutch, and drive to the nearest auto parts store to get the battery charged/tested/replaced. On some cars, if the alternator is strong enough, you can carry this method for a week or so. Not recommended though, or you'll be buying a new alternator as well.
        Peter_G
        • 1 Year Ago
        @BJMcGee
        Most people who would know how to get at their alternator, or even know what one looks like probably don't drive, or don't choose to drive an auto.
          GearheadGeek
          • 1 Year Ago
          @Peter_G
          Except that unfortunately for a newish half-ton pickup I didn't even have an option for a manual. Both of our cars are manuals, though. Being a fairly serious (frivolous?) gearhead, though, I have 2 different battery chargers and a generator with 120v and 12v outputs, so one way or another I could get started at the house, and if I'm not at the house I'm not that likely to have a chainsaw handy to hitch up in the first place. ;)
      Drakkon
      • 1 Year Ago
      I saw Colin McRae use shoe laces for a belt on his car mid-stage. Chances are he stole Nicky's shoelace and made him walk back barefoot, but hey!- got back to service.
      bluepongo1
      • 1 Year Ago
      1) Buy a dedicated: gas or propane chainsaw, a truck alternator, and an extra charging cord for your Leaf or Tesla.....2) Permanently combine all three in a similar manner as the guy in the story..........3) ?????????????? ..............4) Profit!!!! ( With your BEV/ ICE emergency charger!!!1!!!1!!!) ...........;-)
        OnTheRocks
        • 1 Year Ago
        @bluepongo1
        You could also just buy a generator from Home Depot and keep it in the trunk. Not efficient at all though.
      Tom
      • 1 Year Ago
      This is so stupid on so many levels, and I still fail to see why stuff like this even makes it on AB. That having been said, I'll cover the issue here that many actual car owners and enthusiasts surprisingly don't (but SHOULD) know: An alternator's purpose is to maintain a battery and the electrical system as a whole at the optimum charge level. An alternator is NOT intended to be the life support system of a vehicle AND charge a depleted battery. When your battery is too dead to crank your vehicle, you should charge it properly - or in emergency situations, such as jump-starting, let the cables charge it for at least 5 minutes prior to starting and leave them connected for at least 5 minutes afterwards. Using an alternator as a battery charger can lead to premature failure, especially on the type of vehicle that will usually need a battery charge - an older one with higher miles in non-ideal climate. Because since when does your battery die on a beautiful 70° day?!
        Johnny R
        • 1 Year Ago
        @Tom
        Did you even watch the video? Its a f'ing "what if scenario". If he had a backup battery charger or another car right next to him, then why would he even bother to disassemble the chainsaw. Get off the high horse, why don't you.
        xersn
        • 1 Year Ago
        @Tom
        Your reply is just as dumb... jump starting is getting a charge from another spinning alternator.. alternators charge batteries, do you even know what an alternator / charging system is on a car?.. includes rectifiers, converts AC to DC, voltage regulator to protect the battery.. etc..
        Agilis
        • 1 Year Ago
        @Tom
        Yes. Your comment is way off the mark. Please step off your soap box before it collapses... Oops. Too late. The car battery does not power the car, your alternator does. Therefore IT IS the life support of the vehicle. The battery is there to help take a small load off the alternator, to start the car, and for off-engine accessory use.
      Narom
      • 1 Year Ago
      I tend to buy better cars.
      ihatedavebushell
      • 1 Year Ago
      Thank god for this, I never have booster cables or a battery charger around the garage or in the car, but I always no matter what have my trusty chainsaw in the trunk and all the tools to relieve tension on the serpentine belt tensioner (because they have been the only thing used on cars for like 25 years) and then I also have an old belt that will reach the alternator, which is mounted on the bottom of my motor, so it is super easy once I jack up the car really high, remove the undertray and the lower coolant hose. Why didn't I think of this, it is just short of genius!
      Agilis
      • 1 Year Ago
      Might be because I'm tired, but what if the chainsaw motor and and alternator motor spin in opposite directions?
      d
      • 1 Year Ago
      if youre in a pinch and happen to have wire and cordless power tools, you can also use those batteries to jump start your car. http://www.youtube.com/watch?v=IaDfIQa0AN8
      • 1 Year Ago
      [blocked]
      FordExpy1998
      • 1 Year Ago
      You need some voltage in the system to cause the alternator to charge, if the battery is COMPLETELY dead then you are screwed. Cool though, if in a pinch.
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