Jump Start 24 Volt System

Jump starting a 24volt truck from another 24volt truck.

Jump start 24 volt system.

Connect a jump lead from the positive terminal to the positive terminal on the 24 volt truck battery. The same result will be achieved by connecting the red jumper cable to the positive terminal marked a and the black jumper cable to the earth terminal or chassis of the bus. Some 24 volt systems use 24 volt batteries while others wire two 12 volt batteries in series. Vintage cars may have 6 volt electrical systems or may connect the positive terminal of the battery to the chassis.

Since the power of a 24 volt system will overload a 12 volt one in another vehicle you will need another 24 volt battery to provide the power. In either case if a vehicle with a 24 volt battery needs a jump start it can be a headache. You don t because of the voltage differences between sources to jump start you must have the same voltage at destination and source the source may be higher than the destination but destination. Since the power of a 24 volt system will overload a 12 volt one in another vehicle you will need another 24 volt battery to provide the power.

Some 24 volt systems use 24 volt batteries while others wire two 12 volt batteries in series. Trucks usually have a 24 v supply using two 12 v automotive batteries in series. Put the 24 volt truck in neutral and start it following the normal procedure. It is therefore possible to jump start a vehicle with a 12 v electrical system using only one of the two batteries.