67 Camaro Alternator Issue? - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 27th, 10, 11:29 AM Thread Starter
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67 Camaro Alternator Issue?

I have replaced 3 batteries in a 4 month period. Each time I returned them I was told that the battery had a bad cell and was given a free replacement. Each time I replace the battery, it starts great for about a month, then starts slower and slower each time until finally it just doesn't start. Now again, my car wouldn't start. I am thinking the issue is with the alternator. Is it possible that something could be damaging the battery? Not an expensive fix or anything and I know I can have the alt tested, was just curious if this is a common symptom for a bad alternator. Thanks for your replies.
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post #2 of 7 (permalink) Old Dec 27th, 10, 12:52 PM
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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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post #3 of 7 (permalink) Old Dec 28th, 10, 06:42 PM
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Re: 67 Camaro Alternator Issue?

A friend of mine just replaced his second battery and was told, "oh yeah, this is one those batteries", meaning a series of duds from the manufacturer. In other words, you can get 3 bad ones in a row - though they'll likely from the same batch.

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post #4 of 7 (permalink) Old Dec 29th, 10, 01:33 PM Thread Starter
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Re: 67 Camaro Alternator Issue?

Yeh, it was the alternator. Took it to Oreilly's and it tested bad. Replaced it and im good to go. Finally my GEN light is off. Has been on since I bought the car. Thanks for the resonses guys.
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post #5 of 7 (permalink) Old Dec 29th, 10, 03:04 PM
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Re: 67 Camaro Alternator Issue?

What kind of alternator is it?
External reg'd or internal reg'd?
If ext reg'd, change the voltage regulator to an electronic type I described earlier, Post 2, and charging voltage will be closer to the same at low rpm and high rpm.

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post #6 of 7 (permalink) Old Jan 28th, 11, 07:59 AM
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Re: 67 Camaro Alternator Issue?

Everett
question for you. I think I am going to do the fix you described here using the wells PN 715 FOR MY 1968. Is this fix better than swapping over to an internally regulated alternator?

Thanks
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post #7 of 7 (permalink) Old Jan 28th, 11, 08:29 AM
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Re: 67 Camaro Alternator Issue?

'better'? probably not any better, either way will charge the battery and run your system just fine. The Wels regulator Ev spoke of is such an easy replacement and it eliminates the old way of regulating elec. power and makes everything run so nice, eliminates dimming of headlights when you slow down etc. its also so cheap, around $10. It also is same size and the old original black cap fits on it as well

Here is my Wels regulator in place with old original black cap on it :



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