hour meter OC4

[walter hudson]

I have two OC4 gas models that have been changed from 6 to12v and want to use the hour meters . I assumed that a 6v would be a different meter than a 12v .I looked in the parts book and only one part # is shown for gas and diesel hour meters. There is no type of resister shown on the wiring diagrams for a gas to be able to use the same meter. The rear of the meter has 6  12vdc stamped on it . Does anyone know what I am missing ?
Walter

[Jim N]

One thing you could do is put your multi-meter in series with the hour meter.
So with your multi-meter set to measure current (probably in milliamps) , hook up the hour meter to a 6Volt battery so it operates.
Copy down your milllamp measurement and use Ohm's law to figure out the resistance for the same current at 12Volts.
If you need help doing the calculation, I can help you if you give me the current measurement.  
Lemme know.      Jim