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Re: DHow does the amp meter in a 66C20 work?
The gauge is fed by a voltage close to the battery and one close to the alt. It moves left or right depending on which voltage is slightly higher than the other The gauge is just an indicator of whether the battery is being charged or not. Look for small 4A inline fuses at the fender core support corners. They're probably about 1.25" long and black rubber.
Sounds like the current draw is in the alt/regulator circuit, not the battery gauge.
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