Re: 67 Camaro Alternator Issue?
At operating temperature, you should measure charging voltage across the battery posts and at 2000 rpm, no accessories on, just ignition, the voltmeter should not be less than 13.8 volts if you still have the mechanical voltage regulator.
The symptom of a slower start in time means the battery is not getting recharged enough and/or a long recharge time. At lower rpm, by design, the charging system was designed just for the car and a radio, nothing else. Any current needed at a lower rpm came from the battery. At the time, people revved the engine alittle higher always, we didn't have to worry about gas mileage. Also, with the same symptom, the regulator may need a little adjustment of more voltage.
A good fix, Plug & Play, would be to substitute the mech regulator with an electronic one Wells P/N VR715. Don't forget the strap on one of the mounting bolts to ground the chassis.
Make sure the alt belt is tight and if you can't remember the last time it was changed within the last four years, replace it.
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