What Happens If You Hook A Battery Up Backwards. Most of the time when a battery is connected backwards two things usually results. A battery can explode when the cables are hooked up backwards.
The battery should be OK but some of your electronics would be fried. Most likely you just blew a fuse. Then hook the battery to a charger with correct polarity and recharge it.
ZombieWoof March 5 2010 431pm 11.
If you put a wire across both terminals on the battery you would have a short circuit of 12 volts What happens when you hook up jumper cables backwards. I am now attaching the key and getting two beeps but it wont crank at all or even engage. Hooked up correctly I have no ignition or trim. Herein what happens if you connect a battery backwards.
