First of all its the Generator NOT the Voltage Regulator that gets Polarized.
1. Did I destroy the "pricey" USA made voltage regulator by installing it on a tractor with incorrect wiring ? I realize now that the "L" terminal on the regulator is the source to supply voltage for lights or ignition. Would running power from the amp meter to the "L" terminal cause damage to the regulator or generator
I cant say how the incorrect wiring was configured so cant answer that question HOWEVER one way to harm a Voltage Regulator is if the genny were incorrectly polarized and you start the tractor.
I doubt running power from the L terminal to the ammeter damaged the Voltage Regulator
2. Why did the first regulator I installed a few years back, work for a while and then give out instead of just frying like this last one ??
If a VR is designed specifically for one ground and you use it at the opposite the contacts can be harmed. The Delco literature Bob posted explains some of that. A VR needs a good ground to work, I just cant say why yours fryed.
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