Question about 1995 GMC Sierra C1500

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Alternator will dip below 14v briefly and truck starts running rough

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Check your ground strap it might be corroded. also make sure your alternator belt does not slip. hope this helps and god bless.

Posted on Feb 04, 2010

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Probably running rough because some of the plugs start missing (not sparking when thier turn comes).
since your voltage is dropping briefly, this could be because of a loose wire, bad alternator brushes, bad starter relay, or one of the coils is bad or has a short.

Posted on Feb 04, 2010

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Battery icon displays at times but lights stay bright and nothing seem wrong.


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This is an early warning sign that there is a problem in your charging system. The alternator is likely starting to go bad or may have a burnt diode. Take some time to check the drive belt, if it's too loose it will create the same problem. Try to turn the alternator by hand, it shouldn't, or at least not easily with a serpentine belt. Hope this helps.

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Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be around 12V+-.2. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery properly. If it's above 14V, then it means your alternator is overcharging and damaging the battery.

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Check your alternator as it sounds like it may be starting to go. The battery light trips when it detects an issue with the charging system. Very rarely, the battery light can trip if there's an issue with the PCM, but this is very rare.

Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be around 12V+-.2. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery properly. If it's above 14V, then it means your alternator is overcharging and damaging the battery.

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You should also check to see if there's an issue with the alternator itself. It should read 13-14V +-.2V across the terminals with the car running and the alternator cranking.. If it's below 13, then it's undercharging your battery. If it's above 14V, then it's overcharging and damaging your battery

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