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Alternator Light Stays On, Car Running -FIXED..?
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vamram Premium Member
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PostPosted: Thu Aug 07, 2025 2:25 pm    Post subject: Alternator Light Stays On, Car Running -FIXED..? Reply with quote

I just finished rebuilding the motor on my '74 and wanted to take it out for the ring break-in, but the alternator light is staying on *bright* when the car is on. This is an externally regulated alternator. Here's a picture of the connector at the top of the alternator. I had to rewire it as 2 of the 3 wires were deteriorated and came apart from the plug when I was removing the motor months ago. Did I rewire it incorrectly?
Image may have been reduced in size. Click image to view fullscreen.

I've never had an issue w/this car's alternator and it has a good relatively new battery. I didn't touch any other wiring.

Thanks!
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'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
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Last edited by vamram on Yesterday 12:35 pm; edited 1 time in total
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Matt Wilson
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PostPosted: Thu Aug 07, 2025 5:19 pm    Post subject: Re: Alternator Light Stays On When Car is Running Reply with quote

Chase the warning light wire to see if it is making contact with any metal, this would keep the light on.
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vamram Premium Member
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PostPosted: Thu Aug 07, 2025 7:14 pm    Post subject: Re: Alternator Light Stays On When Car is Running Reply with quote

Thanks Matt - but I may have found my problem. Compare this picture from Speedy Jim's page to the picture of my rewired alternator plug. It looks like I have the green and brown wires reversed.

Rewired plug - bottom of the picture is the pulley end:

Image may have been reduced in size. Click image to view fullscreen.


Speedy Jim's wiring graphic:
Image may have been reduced in size. Click image to view fullscreen.

The brown should be swapped w/the green one so it looks like I messed up when I reassembled the plug. Question is - if this is in fact the problem, have I fried the alternator or the regulator in the process??? Embarassed Shocked
_________________
"Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke

“If something cannot go on forever, it will stop.”
Stop Russian-Soviet Aggression!!

'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
Click to view image
Save the Supers!!
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vamram Premium Member
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Joined: March 08, 2012
Posts: 8025
Location: NOVA
vamram is offline 

PostPosted: Yesterday 12:37 pm    Post subject: Re: Alternator Light Stays On, Car Running -FIXED..? Reply with quote

I fixed the wiring and started the car just now and the light behaves as it should again - key on/light on, car starts and runs/light goes off.

Maybe I dodged a self-inflicted wound...Guess we'll see how things behave on the road...!
_________________
"Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke

“If something cannot go on forever, it will stop.”
Stop Russian-Soviet Aggression!!

'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
Click to view image
Save the Supers!!
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View user's profile Send private message Send e-mail Gallery Classifieds Feedback
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