The Ford Barn

dbdevkc · 12-31-2023, 11:11 PM

Quote:

Originally Posted by Jack E/NJ

>>>That wire labeled alt exciter doesn't even run to firewall forward>>>

Check to see if a wire is connected to the alternator's exciter terminal. Then try to trace to its other end.

Turns out it is a one wire alternator, so as far as I can tell... no exciter terminal.

Jack E/NJ · 01-01-2024, 06:58 AM

>>>As long as the ignition switch is on, car running or not, if we switch that toggle the LED comes on.The wire going to that switch is labeled "Alt Exciter">>>

Maybe it originally was for a 3-wire exciter. Now sounds like the other end is simply grounded somewhere. So it's just a light switch. Might come in handy sometime depending on where the lamp is located. 8^)

Dec211975 · 01-06-2024, 08:02 PM

Is this a Delco 10SI alternator ? In the 10SI there is a diode trio that filters the signal going back to the indicator bulb if the three legs on this trio do not match ( one leg shorted or open) then the indicator light will remain lite and ultimately drain the battery this can be tested with an ohm meter checking polarity. The former owner maybe had an issue with the battery draining and installed the switch. I am sure other alternator's use A variance of the same design.

https://www.google.com/aclk?sa=l&ai=...c0Qwg96BAgBEDU

01-01-2024, 06:58 AM	#22
Jack E/NJ Senior Member Join Date: May 2010 Posts: 2,173	Re: Electric - "Alt Exciter" switch and light >>>As long as the ignition switch is on, car running or not, if we switch that toggle the LED comes on.The wire going to that switch is labeled "Alt Exciter">>> Maybe it originally was for a 3-wire exciter. Now sounds like the other end is simply grounded somewhere. So it's just a light switch. Might come in handy sometime depending on where the lamp is located. 8^)

01-06-2024, 08:02 PM	#23
Dec211975 Senior Member Join Date: Feb 2011 Location: Monroe, Wi Posts: 247	Re: Electric - "Alt Exciter" switch and light Is this a Delco 10SI alternator ? In the 10SI there is a diode trio that filters the signal going back to the indicator bulb if the three legs on this trio do not match ( one leg shorted or open) then the indicator light will remain lite and ultimately drain the battery this can be tested with an ohm meter checking polarity. The former owner maybe had an issue with the battery draining and installed the switch. I am sure other alternator's use A variance of the same design. https://www.google.com/aclk?sa=l&ai=...c0Qwg96BAgBEDU