Factory ammeter

gm1236 said

I’m having an overcharging problem, I’m getting 16 volts out of the batt. Lug on the alternator, but 14.5 at the battery and starter relay. I have tried 3 regulators and 2 alternators no change. I’ve checked the green field wire and it’s fine between the alt and vr. Where do I go from here? It’s a 75 duster.

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This problem has nothing to do with regulator. Your battery voltage is not bad. What this is, here, is simple voltage drop in the harness, in the circuit path from the alternator to the battery. Depending on how big the altlernator is, and how hard it is charging at the time, this may be anywhere from "sort of acceptable" to note even on the acceptable planet.

The charge path in a stocker is alternator......black output wire.........through the bulkhead connector..........to the under-dash welded splice------through the ammeter and the ammeter connections---------out on the red wire--------back out through the bulkhead connector---------through the fuse link-------to the starter relay stud---------and to the battery.

EACH POINT separated by dotted lines is a point of potential voltage drop. The potential "worse offenders" are likely the ammeter, the bulkhead connector, and maybe connections at the fuse link. Also "in the mix" are the wire end terminals at the alternator, the ammeter, and the wire end on the fuse link to the starter relay.

This drop is going to depend on how much current the alternator is putting out, IE how low the battery is, and how much in the way of load/ accessories are powered at the time.