Author Topic: Overcharging  (Read 217 times)

Offline Jon87V20

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Overcharging
« on: March 12, 2018, 08:02:53 PM »
About a week ago, I noticed the dashlights in my '87 Chevy Suburban V20 were pulsing at idle. I checked the output on the alternator, and it's showing almost exactly 15v. It drops down slightly to about 14.7 or 14.8 when engine speed increases. The pulsing only happens at idle.

Is my regulator dead in the alternator? Can this damage my battery? I bought an Optima Yellow Top for this thing and really don't want to destroy it.
1987 Chevrolet Suburban V20 Silverado
350ci TBI TH400 NP208

Offline Jon87V20

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Re: Overcharging
« Reply #1 on: April 02, 2018, 05:03:44 PM »
When I went to AutoZone to buy a replacement alternator, I had them test the old one just for the heck of it. It actually passed for some reason. I installed the new one anyway at it resolved the issue.
1987 Chevrolet Suburban V20 Silverado
350ci TBI TH400 NP208

Online VileZambonie

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Re: Overcharging
« Reply #2 on: April 02, 2018, 05:12:38 PM »
Having autozone test anything is a mistake  ;D

Glad you got it fixed
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