1999 Chevy Tahoe Voltmeter spikes to 19 Volts

Tiny
TONYJ21
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I was wondering what would cause my voltmeter to spike to 19 Volts, then I believe it resets something in my computer because the air bag warning light blinks a few times and when shifting from 1st gear to 2nd gear it shifts really hard.
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Tuesday, November 11th, 2008 AT 12:36 PM

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Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

The alternator is over charging, get it checked I feel it will be a faulty voltage regulator.

Mark (mhpautos)
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Tuesday, November 11th, 2008 AT 11:38 PM
Tiny
ALBERTL
  • MEMBER
  • 1 POST
My 99 jeep did the same.
Jumped to 19 volts on guage then down to normal when slowed down.

I had the aternator taken apart and the brushes and commutator were worn badly after 190,000 miles.

So my guess is at high speed the wear was evident and caused the computer to say 19 volts as a warning.

Simply replace the alternator or have rebuilt like I did for $60. Better replace starter too as it must be worn also.

Sometimes it can take 5 days or so to get a alternator and they can be hundreds of dollars of $125
better get too it as the 19 was a warning it is worn out.
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Monday, December 29th, 2008 AT 2:44 AM

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