Volts ?

[fastwolff]

I have a 1960 mack h-67 and the questions are!

1. is this truck 12 or 24 volt?

2. is it positive ground from the factory?

3. how can I tell if it has been changed over to neg through the years?

I bought the truck at auction and the batteries were hooked up for 12V. The batteries where new and had 12 v each but I still had to jump as the truck did start but, turned over slow.

[HK Trucking]

I have a 1960 mack h-67 and the questions are!

1. is this truck 12 or 24 volt?

2. is it positive ground from the factory?

3. how can I tell if it has been changed over to neg through the years?

I bought the truck at auction and the batteries were hooked up for 12V. The batteries where new and had 12 v each but I still had to jump as the truck did start but, turned over slow.

In it's original configuration it should have had a 12 volt positive ground system with a series parallel switch to send 24 volts to the starter when starting.

To tell if it is presently pos. ground or neg. ground, using a test light, ground the wire from the test light to the frame of the truck, then put the test light probe on the bat. cable connections at the batteries.

If touching the positive terminal causes the light to come on, then it's neg. ground, if touching the probe to the neg. terminal causes the light to come on then it's positive ground.

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