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vamram  Samba Member

Joined: March 08, 2012 Posts: 8025 Location: NOVA
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Posted: Thu Aug 07, 2025 2:25 pm Post subject: Alternator Light Stays On, Car Running -FIXED..? |
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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?
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! _________________ "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!!
Last edited by vamram on Yesterday 12:35 pm; edited 1 time in total |
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Matt Wilson Samba Member

Joined: November 14, 2005 Posts: 2426 Location: Colorado
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Posted: Thu Aug 07, 2025 5:19 pm Post subject: Re: Alternator Light Stays On When Car is Running |
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Chase the warning light wire to see if it is making contact with any metal, this would keep the light on. _________________ 1972 Standard Beetle
1969 Baja Beetle |
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vamram  Samba Member

Joined: March 08, 2012 Posts: 8025 Location: NOVA
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Posted: Thu Aug 07, 2025 7:14 pm Post subject: Re: Alternator Light Stays On When Car is Running |
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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:
Speedy Jim's wiring graphic:
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???  _________________ "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  Samba Member

Joined: March 08, 2012 Posts: 8025 Location: NOVA
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Posted: Yesterday 12:37 pm Post subject: Re: Alternator Light Stays On, Car Running -FIXED..? |
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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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Back to top |
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