Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries. The heat can melt internal and external battery parts, while the pressure from the hydrogen gas can crack the battery casing.

What happens if you put battery cables on wrong?

Fuses (and/or fusible links) act as circuit protection devices between the battery and the vehicles electrical system. Connecting the jumper cables backwards will often result in one or more blown fuses. The affected circuit will not function correctly until the blown fuse is replaced.

What happens if you hook a battery charger up backwards?

Damage the Charger The working systems of both the battery and the charger are affected when the cables are attached incorrectly. The basic phenomenon behind this is that as the polarity of the terminals is changed it could send the incorrect polarity back into the charger. This will permanently damage the charger.

What happens if you connect positive to negative?

Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries. The heat can melt internal and external battery parts, while the pressure from the hydrogen gas can crack the battery casing.

What can reverse polarity cause?

Reversed polarity can damage or short-circuit your appliances. This wiring mistake within outlets can cause household appliances to overheat or damage the internal circuitry and wiring.