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Voltage regulator ???

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Old Dec 14, 2008 | 07:12 PM
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Default Voltage regulator ???

Did a search came up w/not much

Alternator is 1 yr old rebuild. When I start the car voltage warning light comes on at 11.5 - 10.9 volts and stays there for a few seconds if its warm out, and up to a minute if its below 32*F. So it was 20*F the other morning, and after a full minute of 11.5 volts the warning light goes out and the interior lights get brighter w/14.1 volts on the meter. Voltage stayed at 14 volts the whole hour ride home. So the question is should I be replacing the regulator before I get stuck. I also checked to make sure all the wire connections are tight on the Alt.


I lost the reciept so a return is not a option, and a new one is over a $100.
Good news is the Local Parts store has the Regulator for $20, and the Diodes for $6

Last edited by 84REDCROSSFIRE; Dec 14, 2008 at 07:19 PM.
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Old Dec 14, 2008 | 07:23 PM
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Id replace the Reg,ever done it before?Piece of cake.
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Old Dec 14, 2008 | 07:56 PM
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Originally Posted by Z51JEFF
Id replace the Reg,ever done it before?Piece of cake.
Yes, done a few REG's over the years on GM's. Guess now I have something to do tommorow. Still can't figure out why the cold Temps makes a difference ??? Maybe a cold sodler joint somewhere inside the Reg ?
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Old Dec 14, 2008 | 09:44 PM
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how do you replace one, where is it located?
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Old Dec 14, 2008 | 11:04 PM
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Its inside the alt,not hard but if somebody's never done one the brushes can be a pain.
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Old Dec 15, 2008 | 12:13 AM
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If you have an '84, you might be interested in a write up I did in the tech section, here, on upgrading to a newer CS alternator. I rebuilt my 17SI, like yours, in my '85 quite a few times before I found out about this upgrade.
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Old Dec 16, 2008 | 12:47 AM
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Default Could be this

I have seen this caused by a worn belt that has to get some heat in it to get some "bite"
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Old Dec 17, 2008 | 02:02 AM
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Thanks for all the posts , I checked the belt and it was good.

I'm gonna change the reg out w/a new one, and prob wait to do the CS144 conversion if the new reg works. A new reg is only 10% the cost of the CS conversion.
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