Most Likely the alt checking out.
weird problem
Thread Starter
Advanced
Joined: Aug 2004
Posts: 88
Likes: 0
From: Greer SC
weird problem
I think I have an electrical problem with my '00.
When the car has gotten warm, and I am sitting still (like at a stoplight), I can hear a high pitched whining noise. It fluctuates up and down at about 1 second frequency (on off in a second). If you look at the radio display, it seems to flicker at the same frequency.
Also, if I hit the power windows (both up even when they are fully up), the lights dim noticeably (including the head lamps), and the voltmeter drops momentarily from 13-14V to 11V. But, it recovers quickly.
I can't see or hear the noise when driving (the wonderful exhaust is too much).
Any suggestions?
Thanks in advance!
When the car has gotten warm, and I am sitting still (like at a stoplight), I can hear a high pitched whining noise. It fluctuates up and down at about 1 second frequency (on off in a second). If you look at the radio display, it seems to flicker at the same frequency.
Also, if I hit the power windows (both up even when they are fully up), the lights dim noticeably (including the head lamps), and the voltmeter drops momentarily from 13-14V to 11V. But, it recovers quickly.
I can't see or hear the noise when driving (the wonderful exhaust is too much).
Any suggestions?
Thanks in advance!
Safety Car
Joined: Dec 2002
Posts: 4,010
Likes: 1
From: SE Idaho
St. Jude Contributor
Have someone check out the electrical system; places like Advance Auto will do it. It is normal for the light to dim when placing a heavy load such as a power window to its full-stop position.
The PCM is programmed to slowly raise the voltage output of the generator when a load is applied; and the car is at idle (below about 1K RPM). If it shot the generator up to full power the instant a heavy load is applied, the idle would drop, and in some cars the engine could stall.
However, your drop to 11 volts sounds excessive.
The PCM is programmed to slowly raise the voltage output of the generator when a load is applied; and the car is at idle (below about 1K RPM). If it shot the generator up to full power the instant a heavy load is applied, the idle would drop, and in some cars the engine could stall.
However, your drop to 11 volts sounds excessive.
Race Director
Joined: Feb 2004
Posts: 11,651
Likes: 9
From: HOW FAST WAS I GOING OFFICER? Los Angeles Hating GM Dealership Service Dept.'s Since Sept. 2004
St. Jude Donor '04-'05-'06-'07
1. Are you running an amp with your stereo?
2. Do you still have your AC CrapCo Battery?
Never noticed the fuel pump sound fluctuate. It's usually a pretty steady whine.
2. Do you still have your AC CrapCo Battery?
Never noticed the fuel pump sound fluctuate. It's usually a pretty steady whine.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
