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1977 MGB Alternator Overcharging


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driver1
New User

Sep 2, 2011, 1:05 PM

Post #1 of 6 (3098 views)
1977 MGB Alternator Overcharging Sign In

1977 MGB, 4 cylinder, 147,000 miles.

We are having a problem with the alternator in this vehicle overcharging. It has been replaced twice, and is having the same problem. Both times it was replaced with a rebuilt alternator, if that makes any difference. Any idea as to what is going on here?

Thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 2, 2011, 1:47 PM

Post #2 of 6 (3080 views)
Re: 1977 MGB Alternator Overcharging Sign In

Being a 1977, it likely has an external voltage regulator which would be the problem.



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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.



driver1
New User

Sep 2, 2011, 7:28 PM

Post #3 of 6 (3070 views)
Re: 1977 MGB Alternator Overcharging Sign In

Where would one find the external voltage regulator?


(This post was edited by driver1 on Sep 2, 2011, 7:28 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 3, 2011, 3:02 AM

Post #4 of 6 (3059 views)
Re: 1977 MGB Alternator Overcharging Sign In

I have no idea on that one. If you expert to make any repairs on a car like that, you can't do it without having a service manual for that car so if you don't already have one, that should be your first priority.



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

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.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 3, 2011, 9:34 AM

Post #5 of 6 (3051 views)
Re: 1977 MGB Alternator Overcharging Sign In

Think it's on the firewall but guessing. Don't let it overcharge or you'll blow all light bulbs if used, the alternator will burn up and take out the battery too and who knows what else?

T


(Edited: Should have said DON'T allow "Voltage" where I said "overcharge" instead above and post is at it was. Yes - it can and will blow things, like head and tail lamps, dash bulbs are a pest in these critters to change out and these critters are well known for wiring issues but a lot of fun. Fixed up an MG Midget once - fun! Would fit in my trunk but still fun.)



Land/Place - world known for Lincolns which I've only owned a couple dozen of but down to three right now.



(This post was edited by Tom Greenleaf on Sep 3, 2011, 1:16 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 3, 2011, 1:19 PM

Post #6 of 6 (3047 views)
Re: 1977 MGB Alternator Overcharging Sign In

See edit above in this thread by me,

T






 
 
 






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