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2002 Silverado battery light on


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I'm thinking this is an alternator issue but wanted to get other ideas. My 2002 Silverado has 160k miles on ...

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Old 02-03-2016, 07:08 AM
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2002 Silverado battery light on

I'm thinking this is an alternator issue but wanted to get other ideas.

My 2002 Silverado has 160k miles on it. This is the original alternator. When I first start it after it sits for a few hours, basically when it is a cold start. The battery light comes on and stays on until I bring the rpms up. What is also weird is I have a Scangauge II installed and the display will not come on until I bring up the rpms.

When I first start it, the volt gauge on the dash is showing 10vdc. When I bring the rpms up it goes up to 14.2 and the ScangaugeII comes on and it shows 14.2 as well and the battery light goes out. From there on out it runs fine. No other issues with the light coming on. Driving it around the ScanguageII shows 13 to 14vdc.

All my electrical connections are clean and tight, as well as all the grounds.

Do you think this is an issue with the regulator inside the alternator?

I was going to pull it off and have it rebuilt. Not a fan of getting one off the shelf at AZ,AA, CQ or O'Rileys.
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Old 02-03-2016, 04:49 PM
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Took the alternator off and had it rebuilt. The place tested it and it showed good. But when I picked it up he said it was amazing that it was putting out any power at all. The brushes were gone and the slip ring was shot. So it is all back to new with new bearings and all and out the door for $75.

Not to bad since a new Delco at Advance Auto was showing $174.
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Old 02-03-2016, 05:25 PM
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Glad to help!



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Old 02-03-2016, 05:47 PM
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Just as I suspected.
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Old 02-03-2016, 06:32 PM
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I put a new Delco on momma's Tahoe last year before we made the long drive. Delco alternators have served me well. I have had some bad experiences with rebuilt electrics.

So have my many customers
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Old 02-03-2016, 07:03 PM
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I put a new Delco on momma's Tahoe last year before we made the long drive. Delco alternators have served me well. I have had some bad experiences with rebuilt electrics.

So have my many customers
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Old 02-03-2016, 07:23 PM
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I have had some bad experiences with rebuilt electrics.

So have my many customers
Maybe you should rebuild 'em better??
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Old 02-03-2016, 09:20 PM
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I have had some bad experiences with rebuilt electrics.

So have my many customers
Maybe you should rebuild 'em better??
We don't rebuild them. It's the ones we get from the vendors. I warranty them all the time
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Old 02-03-2016, 09:21 PM
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I put a new Delco on momma's Tahoe last year before we made the long drive. Delco alternators have served me well. I have had some bad experiences with rebuilt electrics.

So have my many customers
I am sure your local guy does better than the ones we get from the rebuild centers
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Old 02-03-2016, 09:21 PM
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We don't rebuild them. It's the ones we get from the vendors. I warranty them all the time
Quit outsourcing stuff to China!
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