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Old 08-06-2009, 09:12 PM
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18+ Volts!

I took out the old alternator on my '90 454 C1500 truck, as it wasn't working. Put the new 100 amp one in. I was happy as could be seeing the voltmeter read 14 instead of 11 and below for a change. Went for a drive, and the voltmeter started climbing, sometimes to 18+, and it would never drop below 16, even at idle. I barely got the truck home. I was thinking that this might be due to a bad voltage regulator, but it seems that they are inside the brand new alternator, so that worries me. I'm picking up a new regulator tomorrow, but if its not the problem then what? The battery is also new btw.

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Old 08-06-2009, 09:18 PM
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Only thing it could be.

Vince
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Old 08-06-2009, 09:37 PM
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Alright, I'll pickup a new one tomorrow. Hope it solves the issue.
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Old 08-06-2009, 10:39 PM
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When installing the alternator, I didn't unhook the battery (yes yes I know). And I accidentally shorted the alternator batter terminal to my valve cover which caused sparks. Could this have damaged the regulator?
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Old 08-07-2009, 06:43 AM
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Yep.

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Old 08-07-2009, 03:07 PM
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Got a new alternator, no more problems. Lesson learned, always disconnect the battery.
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