Post-op problems - 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 09-04-2011, 02:36 PM   #1
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Default Post-op problems

I just got my alternator put in along with a new belt. She started at 14 volts and gradually went down and stayed normal. After a bit of driving on the highway, coming to a stop, the voltage drops. I turn the wheel from a stop to make a turn into a street, voltage drops. I'm so confused. I just don't understand why she'* still doing this. I just don't get it. :(. Hopefully Dan chimes in. Anyone have any suggestions or solutions?
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Old 09-04-2011, 02:36 PM   #2
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I'm replacing my Diehard Gold *piece of crap* with an XS Power 3400 hopefully soon
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Old 09-04-2011, 04:58 PM   #3
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has your tensioner ever been replaced
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Old 09-05-2011, 02:04 PM   #4
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Quote:
Originally Posted by sseidriver97 View Post
has your tensioner ever been replaced
I don't believe so. You think that'* the problem? It'* just so weird. I feel as if the XS Power 3400 and The Big 3 won't be enough to keep the voltage stable.
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Old 09-06-2011, 03:27 PM   #5
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you check your power and ground connections? ( not just the battery end)
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Old 09-07-2011, 08:15 AM   #6
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You don't say what the voltage drops down to etc. Being in the 92-99 area, I can tell you that there is no "Sense" wire on your alternator, therefore it doesn't know how much voltage it'* putting out. It regulates it'* output, but not based on any input.

Some of us added a Sense wire to help this issue.

also..when you put a load on the motor at idle, like turning the wheels, the engine rpm dips a little. That means the alt turns slower, and produces less power.

Plus your pcm is likely programmed to turn off the alternator field at any rpm under 600.
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Old 09-07-2011, 05:23 PM   #7
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Quote:
Originally Posted by BillBoost37 View Post
You don't say what the voltage drops down to etc. Being in the 92-99 area, I can tell you that there is no "Sense" wire on your alternator, therefore it doesn't know how much voltage it'* putting out. It regulates it'* output, but not based on any input.

Some of us added a Sense wire to help this issue.

also..when you put a load on the motor at idle, like turning the wheels, the engine rpm dips a little. That means the alt turns slower, and produces less power.

Plus your pcm is likely programmed to turn off the alternator field at any rpm under 600.
When I come to a stop or turn the wheel, it drops down to the red. It drops to the line right above the red zone. The lights dim and she starts shaking.

How do I add a sense wire? And where can I get one?

It'* strange because my truck doesn't do that. It worries me since I'm adding some draw to it soon. I just want it to stop
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Old 09-07-2011, 08:46 PM   #8
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This is pretty much the same thing I'm going through as well. In addition to what I stated

https://www.gmforum.com/showpost.php...35&postcount=1
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Old 09-08-2011, 09:50 AM   #9
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Couldn't find the write up on the forum. Found it on another forum

http://www.bonnevillepro.com/forums/...hp?f=36&t=5856
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Old 09-08-2011, 10:48 AM   #10
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you may want to check your power steering fluid cause if its low the pump will strain and slow the serp system causing the alt to slow n voltage to drop
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