Jump Start 24 Volt System

In either case if a vehicle with a 24 volt battery needs a jump start it can be a headache.

Jump start 24 volt system.

Trucks usually have a 24 v supply using two 12 v automotive batteries in series. 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. It is therefore possible to jump start a vehicle with a 12 v electrical system using only one of the two batteries. Jump starting a 24volt truck from another 24volt truck.

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. Connect a jump lead from the positive terminal to the positive terminal on the 24 volt truck battery. Put the 24 volt truck in neutral and start it following the normal procedure. Once the bus starts quickly remove the jumper cables so that the bus alternator can take over the charging of the 24 volt system.

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. Vintage cars may have 6 volt electrical systems or may connect the positive terminal of the battery to the chassis. Connect a second jump lead between the negative terminal and the engine block or other ground connection in the 24 volt truck. 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.