As John said most Fords (Autolite) will be a B circuit system while most Delco units will be A circuit. Personalty I have never seen different but every time I use an absolute I get shot down, LOL. The difference between an A and B type is basically which end of the field (F) circuit is grounded and which end is fed voltage from the battery. The A type is grounded by the regulator and fed internally while the B type is grounded. internally and fed from the regulator. Important to know because a basic system test is to give the field full voltage. Good trouble shooting guides are as easy as searching you topic heading but add "generator" Some things you can check. Does the ammeter even work? Put a volt meter on the battery and check voltage while running. Should be mid 13s-14 if 12V and 7s if 6V. Check grounds. The genny, and regulator both must have good grounding. Did you polarize it after you installed? It should be OK if they ran it on a machine but have seen it not be.
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