what happens when you hook up car battery cables wrong?
left my lights on.took battery out to charge and put battery backwards.while the battery was dead the lights on the dash turned on after it was tryed to be hooked up backwards now with a full battery it doesnt want to start.also the lights on the dash dont even turn on
- ?Lv 67 years agoBest Answer
If your lucky you blow many fuses. But alot of the times every electrical component will puff magic smoke and will need replacing. Especially the Computer, Radio and Body Control Module
- 7 years ago
Hooking up the battery backwards causes a surge that blows the engine main fuse, which is why you're not getting squat in the instrument cluster or otherwise. The main fuse is usually found in the engine bay's fuse box.
If you're really in a jam, u can open the fuse and using a thin enough wire, recreate the link between the two points in the fuse until u can replace it. But turn the battery the correct way first, before u do this. :)
- mahlonLv 67 years ago
If you're lucky and you not only hook them up to the wrong terminals, but you don't make a good connection, then maybe nothing will happen, maybe a few sparks. If you're NOT so lucky, the sparks can ignite the fumes from the battery and cause an explosion. And anticipating other answers that might dispute that simply out of ignorance, don't listen to them.
Here's a simple guide: hook up one of the red connections on the jumper cables to the red terminal on the dead battery; then hook up the other red connection on the jumper cables to the red terminal on the good battery; then connect the black end of the jumper cables to the black end of the good battery; last, hook up the black connection of the jumper cable to a piece of the car's metal frame (not to the black terminal of the dead battery). The farther away from the dead battery, the better.Source(s): I saw a battery explode once and that was enough for me.
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- 0NE TRlCK P0NYLv 77 years ago
The previous owner did that to my Dodge Caravan
- blew out the Body Control Module
- screwed up all the instrument lights
- affected the heater dispersal doors and actuators.
- 3 years ago
What happen if you put the battery post on wrong on the negative side. Whining sound and woke up the next morning the battery in ruin and the sun won't start.
- 3 years ago
1Source(s): Restore Batteries http://teres.info/BatteryReconditioningCourse/?1or...
- Anonymous7 years ago
Car battery lead terminals--are different sizes..?
- JohnLv 67 years ago
YOU'RE LUCKY IT DID NOT EXPLODE WHEN YOU HOOKED IT UP
YOU PROBABLY DONE SOME MAJOR DAMAGE TO THE ELECTRICAL SYSTEM
- 5 years ago