Regardless if its a 3 terminal Voltage Regulator or the older style Cutout Relay, theres usually ONLY ONE wire on the ammeters SUPPLY terminal and that gets to the hot ungrounded battery feed usually via a wire down to the starter where the big batery cable attaches,,,,,,,,,The ammeters other LOAD terminal wires to the BAT terminal on a Voltage Regulator PLUS feeds hot battery voltage to loads like lights and ignition. IE the gennys output PLUS the loads all wire on the ammeters one terminal opposite the other supply terminal.
If it reads bass ackwards, simply reverse the leads. If its wired right if you turn on lights or ignition when shes not running the meter should swing to - discharge but then when running at RPM if shes charging it will swing to + charge, again, if it does opposite reverse the leads
No it wont damage it, just read bass ackwards
When they are converted from Pos to Neg ground the ammeter leads need reversed, of course
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