good eye tclederman . I made the same mistake before, assuming that he was talking Chevy! Am I to assume the radio that you have 54GMC is for a GMC? If it is I also believe that it is positive ground. That will make a diiference and may be the reason for the extra heat. Even correctly hooked up there will be significant heat at the resistor. It is my understanding that all GMC's prior to 1955 were positive grounds and Chevrolet was always negative ground. BTW, As far as the amps goes, when you increase the voltage the amps drop equally ie: a motor rated at 6/12 volts and 3/1.5 amps, when you apply 6 volts you have 3 amps. When you convert it to 12 volts you have 1.5 amps. In your case you would also have to calculate the reducer load because of the heat loss in converting. It will be minimal but you will be able to read it with an amp meter. When converting to 12 volts you can also use smaller size wire/harness. If you use the original wire from the 6 volt you will be safe because it will now become oversized which is good as long as the insulation and connections are good.
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