Do I need a new alternator? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-19-2007, 10:47 AM   #1
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Default Do I need a new alternator?

Keep in mind this is the original one. I flipped by the volts reading on the aeroforce gauge and it says


Monday while Marty was with it said 12.x while driving.
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Old 09-19-2007, 11:02 AM   #2
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That certainly does not look normal. Running it should be in the 14.5 V range.

I would suspect the alternator needs to be replaced. How is your battery
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Old 09-19-2007, 11:11 AM   #3
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Maybe it doesn't look normal for a 2000, it'* right on mark with the readings from my 1997. The charging system and type of alternator used is different between 97 and 00+. I've changed batteries, alternators and battery cables previously.

Went at it with alternators to ensure it wasn't related to them. It'* not.. my car like 13-13.7V at the most. I've looked into the voltage booster..and they don't appear to apply to the setup on the 97'*.
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Old 09-19-2007, 11:14 AM   #4
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Battery is fairly new. Never have a problem starting, or any other electrical quirks.
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Old 09-19-2007, 11:23 AM   #5
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While your gauge reads that pathetic 13.x go hit the battery with a multimeter at the same time.

Mine read 14 or close enough that I figured the parameter the Aeroforce reads isn't quite what is expected.
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Old 09-19-2007, 11:41 AM   #6
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on my 00, the Aeroforce and the DIC show at least 14.5
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Old 09-19-2007, 11:44 AM   #7
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On the 92-99 iv seen it rang (depending on if the car is fully warmed up) from 13'* to 14'*
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Old 09-19-2007, 11:55 AM   #8
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whit my aeroforce stock reading where between 13.8 and 14,1 now since i got the diode on i get between 14.2 and 14.9 but mostly it at 14.5 volts but that on a 98 3 wires alt i think its differend from yours
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Old 09-19-2007, 12:04 PM   #9
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Right Don.. we have the two wire setup.
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Old 09-20-2007, 12:56 AM   #10
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The higher the voltage the better IMO. Take your fuel pump for instance. More voltage will increase flow. I suppose if it'* designed for a lower voltage that might be alright.
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