![]() Troubleshooting Step 1Ĭheck the high ampere fuses in your car. In the worst case, the ECU/ECM can be removed and inspected if a diode has failed. Most of them are designed to withstand reverse polarity. It is not common to damage the Engine Control Unit / Module by disconnecting the battery cables. If current flows backward through lights, that’s not a problem when current flows backward through electronics with diodes such as the ECU / ECM (Engine Control Unit / Module). If your vehicle doesn’t have a fuse (almost all cars do) designed for this purpose, you will send electrical current backward through systems in your car, including ECU, transmission control unit, and more. When a car battery is connected backward, a fuse designed to protect vehicle electronics should blow. Similar symptoms will be experienced when you try to jump-start a dead battery but accidentally connect the jumper cables backward. The dashboard lights are off, and everything is dead. Suddenly, you see a scary spark, and your car dies. ![]() Instead of connecting the positive (+) cable to the positive battery terminal and the negative (-) cable to the negative battery terminal, you hooked them up backward. You decided to change the car battery but accidentally put the cables backward. ![]() Installed a new battery backward, now the car won’t start
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