Re: bad ammeter effect
Not just a gauge. It is an integral part of the whole circuit. A bad ammeter can most definitely effect how a car runs. On a 30, everything except the starter motor itself goes through the ammeter. The ammeter is in series with everything to measure how much current is being used and how much is offset by charging.
It could be a clue, but check all other wires and connectors for tightness and for any corrosion, including those connecting to the back of the ammeter.
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