![]() The best case scenario is that you blow the main fuse by hooking the terminals up wrong. Therefore, many manufacturers install a main fuse that will blow before these problems occur. The good news is that automakers realized this was a common problem for people that don’t understand car batteries. For this reason alone, it’s very important that you always hook up the battery cables the right way. It’s possible to melt the cables or cause a car fire because of the difference. With the jumper cable polarity altered, there’s a big difference in the electrical current that’s flowing to each. RELATED: What Size Jumper Cables Do I Need? (2 vs 4 vs 6 Gauge) What Happens if Battery Cables are Hooked Up Backwards? It’s best if you can take the vehicle for a drive down the highway to get the alternator working faster. Instead, allow the alternator to fully charge the battery. If you shut off the car, you will be facing the same situation over again. The good battery only provided a minimal charge to the dead battery. It’s important that you don’t turn off your car engine for at least thirty minutes. Finally, take the positive cable end off of the vehicle that had the dead battery.You can also remove both the negative and positive cable ends from the vehicle that had the good battery.Once you get the engine running, disconnect the ground connection that uses the negative jumper cable.It could take a couple of tries to get it started. Try to start the vehicle that has a dead battery.Keep up this engine speed for a few minutes. Rev the engine of the good car until RPMs hit 1,500 to 2,000.Start up the car that has the good battery.It’s important that everything is secure. Double-check all of the connections before moving forward.If you do, sparks could ignite the fumes coming out of the battery. You don’t want to place your negative jumper cable end to the negative terminal on the dead battery. All of these create a good ground connection. ![]() It can be on the engine or connected to the chassis of the vehicle. You should look for any bare metal part that is heavy-duty.
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