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I have a 72 Chevy p/u. My amp gauge also does not appear to work. I'm going to get into it after this weekend. My question is how is this one wired to the amp gauge? It uses a flexible printed circuit to feed the dash lights and gauges. Will that wiring trace on this circuit hold up under a full amp draw? The wiring diagrams I have for this truck don't appear to show this circuit clearly.

Is it a stock ammeter, or an aftermarket add-on? Most ammeters use a "shunt" to carry the majority of the charge current, and just bleed a small current through the gauge circuit to deflect the needle. If that's the case, the gauge won't carry full charge/discharge current!
jerry

I have a stock ammeter. I thought it must have a shunt somewhere. Any clue where it might be? I don't see a shunt on the dash panel and it must be shunted before the printed circuit portion. I just got the truck and I don't think it was working when I bought it. I did a conversion on the alternator and got rid of the external voltage regulator. Now I would like to be sure the ammeter is working. I can and will trace out the wires but if you guys know whats going on it would save me a lot of time. (lots of family stuff going on until Monday) Thanks

This system uses the wireing for a shunt.
There are 2 inline fuses in rubber containers
under the hood. The location varies but look
near the junction block & along the harness.
Thats usually all thats the matter is one of
these fuses blown or the holder is coroded.