1994 3.4l Camaro - Voltage stuck at 9-11v, does not increase with RPM - Team Camaro Tech
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post #1 of 2 (permalink) Old Aug 9th, 13, 11:45 AM Thread Starter
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1994 3.4l Camaro - Voltage stuck at 9-11v, does not increase with RPM

So. My "Check Gages" light is on, and my voltage level on the dash is showing very low (seems to be down to 9v if I turn on the lights and roll down the windows, otherwise 10 or 11 volts).

Took it to WalMart and had them run the battery tester on it (was in a hurry), said the battery seemed to be OK but the voltage definitely wasn't picking up with RPM.

Strange thing is, while the voltage is low, it's been consistently low. Hasn't killed my car or battery yet. Just started last night.

Obvious thing is the Alternator, but I was also considering the voltage regulator (don't know if it's internal or external), and I was reading some people talking about the diodes. I don't have any electronics running in my car besides the ones needed to drive, I don't even listen to the stereo.

Anyone seen this problem before? I'm considering pulling the alternator and having it tested. I'm on a tight budget, so if I get an alternator, it will probably be a used one from a junk yard.

Last edited by BrentNewland; Aug 9th, 13 at 11:47 AM. Reason: Insert reason here.
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post #2 of 2 (permalink) Old Aug 9th, 13, 07:35 PM
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Re: 1994 3.4l Camaro - Voltage stuck at 9-11v, does not increase with

Welcome, Brent.
The alternator is an internally regulated type and more than likely, faulty reg or as you suggest, a bad diode. I would lean towards the regulator and replace the brushes if I were doing it.
Probably the best route for you to take is get another alt. Yards do have a 30 day guarantee.

One trick you can do, take a screwdriver and lay it across the rear bearing case of the alt with it running. You should feel a magnetic pull on the screwdriver. No pull, no workie.
You might even measure voltage at the alt BATT stud to see if alt is working. If it is, then a wire disconnect between the stud and battery. Fuse blown?

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