alt. light stays on 65 F100

[tomrooster]

I hooked up the alt today on my 65 project and it worked fine amp gauge says charging 30 amps but light won't go out till I turn off key. I have a wiring diagram but it don't show the idiot light for charging ,oil light works fine. Thanks for any help. Tom

[Toyz]

If you are running the original alternator and regulator, the "I" terminal of the regulator needs to be powered from the light circuit with a parallel 15 ohm resistor shunting the lamp wiring at the lamp. If your system is an upgrade, let me know what it is and the current wiring configuration.
Paul

[tomrooster]

Paul, I'm using a 78 alt. with the reg off same using original wires and connectors. Tom

[tomrooster]

Paul , I just checked and I do have 13 volts at the I terminal . Tom

[Toyz]

If you unhook that wire and turn key on , is that reading from wire or regulator terminal?
Paul

[tomrooster]

wire

[Toyz]

Kindas a long shot, but check the resistor at the lamp for continuity.
Paul

[tomrooster]

Paul , as a long shot I tried a old regulator that I had laying around but it didn't charge at all so I looked thru my boxes of saved parts (junk) and found 2 more, first one didn't charge like the last one and the next one worked and the amp light went out. Now the original regulator was new that came off the 78 I parted out. Go figure. Thanks Tom