AGM or Lead-Acid?

AGM, generally do not like over voltage. Someone on here recently posted an adjustable VR they found.

Do you know how to test for voltage drop to the VR? VERY important.

It is common, if the wiring has not been upgraded, to experience voltage drop to the VR, which CAUSES over voltage. This is usually/ mostly in the harness, but can also occur in the ground path. To check

Turn the key to "run" with engine stopped. Pick the nearest electrical point to the VR IGN terminal, usually the ballast resistor "run" line from the key

Stab one probe of your meter into the top of the battery + post and the other to the "run" terminal. You are hoping for a very small reading, the lower the better. Anything over .3--.4V (3/10 of one volt) look for the cause. With original wiring, the path of loss is fuse link, bulhead connector, ammeter, through it, out on the black wire to the welded splice, to the ignition switch connector and through the switch, out on the IGN1 "run" wire, back out through the bulkhead, and to the ballst resistor and branch off to the alternator field, VR IGN terminal, electric choke, if used, etc.

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To check the ground side, get the engine / bay/ battery warm and normalized, and run the engine on high idle to simulate low to medium cruise RPM. In your case, make sure it is actually charging.

Stab one probe into the top of the NEG battery terminal, and stab the other into the mounting flange of the VR, HARD to get through paint/ chrome/ rust. Once again, the lower the reading, the better. Zero is perfect.