Installed new battery backward, car won't start. You decided to change the car battery but accidentally put the cables backward. Instead of connecting the positive (+) cable to the positive battery terminal, and negative (-) cable to the negative battery terminal you hooked them up backward.
His brother installed the battery backwards and it ended up frying the DME. If I recall correctly, the only damage to the car was the DME.
. can explode. This is true for the battery being charged and the battery in another car being used to supply the charge.. A battery can explode when the cables are hooked up backwards. Anyone standing. How to Replace Spark Plugs.