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I bought a 1957 F40 and need to know if it’s a 12v or a 6v. What’s the best way to find out what volts it has?
 

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I bought a 1957 F40 and need to know if it’s a 12v or a 6v. What’s the best way to find out what volts it has?
Easiest way is to just look at the battery. If it has 3 cells it is a 6 volt system if it has 6 cells it is a 12 volt system. Need to mention, look to see if it is positive or negative ground. Makes a big difference. Look at the battery's negative post marked by a (-) the positive will be marked by a (+) if the negative (Should be a black wire) goes straight to frame, transmission or engine it is a negative ground system which is standard for all modern accessories.
 
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