[C2] Stereo problem
Thread Starter
Intermediate
Joined: Jun 2018
Posts: 35
Likes: 1
From: ironwood mi.
Stereo problem
I’m trying to put a custom audio sound 630 in my 64 coupe. The problem is the stereo works fine when the engine is off when I. Start it up the stereo brakes up.what could be causing this
Thread Starter
Intermediate
Joined: Jun 2018
Posts: 35
Likes: 1
From: ironwood mi.
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From: San Antonio, TX/Mahopac, NY
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Is your alternator working properly? What is the voltage at the battery both with the engine off and then running?
Racer
Joined: Dec 2025
Posts: 285
Likes: 96
From: Pachuta, MS
That probably means your charging system is very noisy (many voltage spikes and unstable voltage). It could mean that eventhough the average voltage is normal (~ 14 volts) that the instantaneous voltage is all over the place so that a voltmeter may not tell you all that much. Noisy output is common with the old vibrating points voltage regulator that was original to your car and to take some of that noise out, Chevy added capaicitors to the regulator. Check to see if that capacitor is still on the regulator. If you are very lucky, it could be something as simple as a loose fan belt or poor ground connections at the alternator, the battery, the regulator, and your audio unit. Unlike other cars with metal bodies, Corvettes are very sensitive to ground connections. You should also make sure the main output connection at the alternator is tight as well as other power connections. You might try adding a fairly large capacitor just before the unit's power connection.
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Verdad Gallardo
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Do you have a loss of power problem, where the whole unit losses power temporarily, and then turns back on ...............OR.......
do you have an audio problem, where the unit remains powered but the sound is heard at a set volume, shuts off, then back on?