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alternator issue ?

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Old May 24, 2018 | 07:55 AM
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Default alternator issue ?

1999 c5 convertible. rebuilt alternator, suddenly only showing 11.4 to 11.8 volts on DIC while driving.
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Old May 24, 2018 | 08:53 AM
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Originally Posted by demon81
1999 c5 convertible. rebuilt alternator, suddenly only showing 11.4 to 11.8 volts on DIC while driving.
Possibly...in any case have your battery load tested first and go from there.
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Old May 24, 2018 | 09:12 AM
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Have you read the sticky in Tech for alternator's. It's a very good read.

The TL;DR version is your DIC's reading is often (read: nearly always) not 100% accurate due to variances and issues leading from the alternator to the IPC and gauges.
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Old May 24, 2018 | 09:17 AM
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Using a multimeter, check the voltage directly:
  • between the battery posts
  • on the alternator
  • between the alternator and the positive post on the battery

Report back your results and it would be good if you could fully charge your battery and have it load-tested at an auto parts store.

DO NOT give your alternator as core. Keep it, so you can still have options.

Last edited by GCG; May 24, 2018 at 09:20 AM.
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Old May 24, 2018 | 10:24 AM
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Moved to C5 Tech.
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Old May 24, 2018 | 12:19 PM
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That's low.
Mine always reads above 13 volts. When I take a meter to the battery while the car is running, I always get over 14 volts.

Last edited by knewblewkorvette; May 24, 2018 at 12:19 PM.
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