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Could blow up the battery, probably burn out one of the main fuses or fuseable links, could mess up the computer or any part of the electrical system of either or both cars.

If by 'jumpstarting the car backwards,' you mean pushstarting the car (with manual transmission) in reverse, then no harm should be done. However, it is often more difficult to start a vehicle by pushstarting in reverse, so whenever possible try to start it in 2nd or 3rd gear forwards.

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13y ago
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15y ago

There is the possibility the battery could blowup. You can damage the complete electrical system.

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Q: What happens if you put jumper cables on backwards?
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How do you jump start a Pontiac Montana?

To jump start a Pontiac Montana, you will need a set of jumper cables and another vehicle with a working battery. First, ensure both vehicles are turned off. Connect the positive (+) cable to the positive terminal of the dead battery and the other end to the positive terminal of the working battery. Then, connect the negative (-) cable to the negative terminal of the working battery and the other end to a metal surface on the dead vehicle (such as a bolt or unpainted metal). Start the working vehicle and let it run for a few minutes before attempting to start the Pontiac Montana.


Where do you put jumper cables on a Chevy suburban battery?

The proper way to use jumper cables to boost a low/dead battery: (1) one end of positive jumper cable to "dead" battery; (2) opposite end of positive jumper cable to "good" battery; (3) one end of negative jumper cable to "good" battery; (4) opposite end of negative jumper cable to GROUND on "dead" vehicle. Remove jumper cables in reverse order.


Where to you put your jumper cables to jump start Lincoln LS 2002?

On the battery posts in the trunk.


What can happen if jumper cables put on wrong?

It could fry the battery or the electrical system on the vehicles


Will a car with a dead battery start if jumper cables are on incorrectly?

if you put jumper cables on the wrong way you WILL kill the battery then if you leave them on you will cause the battery to overheat and swell then will u least expect it, it will blow up.. it will be a miniature hydrogen bomb


Do pomegranates conduct electricity?

all you do is put jumper cables to the water melon and your car and it will explode! ( the water melon)


How do you put rangerover sport in neutral when battery is flat?

Jumper cables from another vehicle or charge the battery. As soon as you connect the charger you can put it in neutral.


The battery was dead when I put jumper cables on it tried to start the keys were not in the ignetion?

Find the keys, then jump it off and try to start the vehicle.


What to do if you try to put jumper cables on battery and sparks come out?

that's normal Make sure you are connecting pos to pos, neg to neg.


What happens If you put ps3 game backwards?

It will tell you it can not read the discc


What if you put jumper cables on wrong and after car is dead and doesn't even make a sound when turning the key?

You can still fry some of the electronics just by putting the cables on wrong.


What can happen when you put your battery cables on backwards on a 2001 Chrysler pt cruiser?

Blown fuses, melted wiring, computer damage,