jumping a 6volt pos ground battery with a 12volt jump box

can I jump a 6 volt pos. ground on a 1954 dodge battery with a portable 12volt jump box?

if so .......... how to hook up cable ends to where?

Thnaks !

2 methods to do this.

1) remember a stock 6v Mopar is POSITIVE GROUND meaning the battery is connected "backwards". Be sure your jump box connection goes + to + and - to -.

2) First method. Disconnect the ground from the battery, connect the jumper, start the car, quickly take off the jumper and stick the ground cable back on before the car stalls. This is the safest method as it cuts the 6V battery completely out of the circuit while the 12V is connected. Only one cable needs to be disconnected to cut the battery out, the ground cable is usually the easiest.

3) Quick method. Have someone in the driver's seat ready to go, stick the jumper cables on, start the car and pull the cables off. Do not leave the jumper cables connected for more than a few seconds. Leaving a 6v battery connected to 12V is NOT a good idea!

There is yet another method. If you need to start a 6v car or move it around and don't have a 6v battery you can use a 12v in its place. In other words, take out the 6v battery and put in a 12v. But be careful.

1) Be sure everything in the car is turned off, such as lights, radio, etc.

2) Do not grind and grind the starter. The engine should start quickly, if it does not, find out what is wrong and use the starter for short periods of time. More than 10 to 20 seconds of use can overheat the starter, if it gets hot let it cool down before you try again.

3) Do not run the car for more than 10 or 15 minutes. Eventually the coil will overheat and possibly the points will burn. I have never had any permanent damage but I did have a 47 Dodge quit due to an overheated coil after idling for half an hour. Once it cooled down it was good as new, no harm done.

When jumping a 6 volt with 12 volts the jumper cable will get hot fast, so it is wise to hold at east one the cables not clamp them.