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ALTERNATOR LT ON

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bolt buster
New User

Jul 25, 2009, 9:30 AM

Post #1 of 6 (1272 views)
ALTERNATOR LT ON Sign In
1970 PONTIAC LEMANS ALTERNATOR LIGHT ON ? CHEV 383 CI AUTO


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 25, 2009, 10:08 AM

Post #2 of 6 (1268 views)
Re: ALTERNATOR LT ON Sign In
What have you done? Have you tested the charging voltage across the battery?
What is it?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



bolt buster
New User

Jul 25, 2009, 12:38 PM

Post #3 of 6 (1260 views)
Re: ALTERNATOR LT ON Sign In
TESTED BATTERY 12.60 YOLTS BACK OF ALTERNATOR 12.62VOLTS UNPLUGED CHOKE WIRE TO CARB LIGHT OUT


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 25, 2009, 12:41 PM

Post #4 of 6 (1256 views)
Re: ALTERNATOR LT ON Sign In
If you got those readings with the engine running, then the alternator is not charging. I can't remember if that year had an external or internal voltage regulator. If it's iinternal, then change the alternator. If it's external, then you will have to full field the regulator and test it again.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jul 26, 2009, 11:39 AM

Post #5 of 6 (1245 views)
Re: ALTERNATOR LT ON Sign In
Hammer; That would be an internal regulator. Didn't those years have a diode, up under the dash, that would go bad? Maybe, it was a relay....can't remember. O.F. disease.Unsure
Loren
SW Washington


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 26, 2009, 11:42 AM

Post #6 of 6 (1241 views)
Re: ALTERNATOR LT ON Sign In
Nothing I'm aware of. The diode is internal to the alternator as far as I know.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.






 
 
 






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