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#1 |
Registered User
Join Date: Oct 2017
Location: Biloxi, mississippi
Posts: 7
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Alternator wires! HELP!
I am helping my friend Al with his '68 Truck. He's 77 and doesn't remember why he cut these wires!
I have found a new passion with fixing his truck because he has all the tools to do it with. The truck starts and runs well but when I pointed out the wires he doesn't have a clue, but may have had a trailer at one time. The off-white wire and blue wire behind the alternator was cut. Are they necessary? The white wire coming from "dual battery indicator", middle bolt, cut as well. Not the same thickness or exact white as cut alternator wire. All help is appreciated. Thank you! |
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#2 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Alternator wires! HELP!
Quote:
They come from the external voltage regulator on the radiator support. If he has this alternator then some one has converted the truck to an internally regulated alternator and the blue and white wires are not needed depending on how the conversion was wired.
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#3 |
Registered User
Join Date: Jul 2013
Location: LI, NY 11801
Posts: 1,140
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Re: Alternator wires! HELP!
What alternator is on the truck? CS or SI or externally regulated?
Pictures help immensely! Bill
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1970 C10 8' Fleetside, L6 250, 3 on the Tree. The most basic of pickup trucks! |
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#4 |
Registered User
Join Date: Oct 2017
Location: Biloxi, mississippi
Posts: 7
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Re: Alternator wires! HELP!
It's a SI, model Ultima 01-0039. How do I know if it's externally regulated? New pic is old alternator, now I know where white wire from dual battery indicator came from, but need to know where to attach on new alternator.
Thank you Last edited by Al1940; 10-15-2017 at 09:31 PM. |
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#5 |
Registered User
Join Date: Oct 2017
Location: Biloxi, mississippi
Posts: 7
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Re: Alternator wires! HELP!
It's a SI. New pic is old alternator, now I know where white wire from dual battery indicator came from, but need to know where to attach on new alternator.
Thank you |
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#6 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
|
Re: Alternator wires! HELP!
Quote:
Then locate the red wire in the regulator plug and run it to the no.2 terminal on the alternator. Here's a picture. The wires will plug into the rectangular hole on the side of the alternator, and you can buy an adapter at autozone or any of the -parts stores and splice the two wires into it. This should make the alternator charge and if you check the battery with the engine running you should measure 14 volts + or - a half volt.
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#7 |
Registered User
Join Date: Oct 2017
Location: Biloxi, mississippi
Posts: 7
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Re: Alternator wires! HELP!
Thanks VetteVet-
Tomorrow's project. Will let you know the outcome! |
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