Re: SS Dash Conversion- Amp gauge question
Those ammeters actually work by measuring voltage - very small voltage. What it's doing is measuring the voltage drop from the battery to the horn relay. The voltage drop is due to heavy current flowing through the fixed resistance of the wiring. The current in the wire times the resistance of the wire gives the voltage drop. If it is charging, there should be a voltage rise, indicated by the needle swinging the other way. But, if everything is working right, you should be seeing no current, all current demands are being met by the alternator, and the battery does not need charging. I think it's working correctly. You could jumper in a known dead battery to the good battery, and see if you get more charging current, but be careful of sparks.