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1985-1996 Fleetwood and Brougham Forum

RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum
Forum for discussions regarding the rear wheel drive Pre80s-1984 DeVille
and Fleetwood, 1985-1996 Fleetwood/Brougham.

Cadillac Forums: Hi, I have a simple question for someone with a manual
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Old 12-08-08, 08:12 PM
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Hi, I have a simple question for someone with a manual

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Hello, first, this forum seems like the best one on the internet, so keep it up guys!! Secondly: I usually just "browse" the forum without posting, because most of my questions have already been answered. However, as of last week my GEN light comes on when I try to use more than one accessory pretty much. Example: I will have the heat on and then try to open the window or lock the doors. It will work, but the GEN light comes on and everything gets really dim for that couple of seconds.

I tried searching for "voltage regulator" but couldn't find any posts for that. I also noticed there was a post a few down about alternators, but one thing that was not mentioned there was the location of the voltage regulator. I believe I have a stock 63 amp alternator, most likely at least 20 years old. I do not have any manuals for my 1978 Deville, no Chilton's, no service manual, no nothing and I was wondering if the voltage regulator was located inside the alternator, or somewhere outside. I already replaced the strap that goes from the negative battery cable to the frame and greased it up. I also looked at all other wires, making sure they are good and tight. I have a good feeling it is the alternator, but if someone could tell me where the regulator is I would appreciate it greatly.

Thank You
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Old 12-08-08, 11:16 PM
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Re: Hi, I have a simple question for someone with a manual

The regulator is an internal part of the alternator on the late 60s and after GM alternators. Take the alternator off, and go in to a shop and have it tested.

Does your problem only occur at idle? If so, check for proper engine idle speed. Also, check your belt, and for proper tension. A loose/glazed belt can give your symptoms as well.
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Old 12-09-08, 09:37 PM
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Re: Hi, I have a simple question for someone with a manual

Thank you for the info, since no one mentioned the regulator I had a feeling it was inside the alternator. On closer inspection of my belt, it seemed OK. But, when I went to Autozone to have the alternator tested they said it was barely putting out much, and the only think keeping the car running was the battery! So I am going to get a new one.
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