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Chris, With an Alternator youre most likely at Negative Ground, therefore, there should be but ONE wire on the ammeters + Supply Terminal and thats the main hot voltage feed which must get to the ungrounded + battery post and thats often wired to the battery (NOT to starter) side of a starter switch or solenoid. The ammeters other -Load terminal (often 2 or more wires there) is what feeds loads like lights n ignition usually via a wire from there to the BAT input terminal on those type switches PLUSSSSS SS its what connects to the alternators big main output stud. If it has a light, there may be that extra lil wire or terminal that connects to the light switch output and there would need to be a ground, maybe via its contact with the dash plate or a lil grounding stud/wire. Ifffff fff its wired bass ackwards it will read backwards in which case all you need to doi is swap sides with the Supply and Load terminals. If all is wired correct n working BOTH ammater terminals must ALWAYS read hot battery voltage as its almost like a short circuit across it. On most alternators (depends on their amperage) I use 10 Gauge wire from the alternators output to the ammeter and from the ammeter to the supply voltage source battery/starter. Post back any questions, good luck n God Bless John T, retired electrical engineer in Indiana
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