Gen lite stays ON in my 67 - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 19th, 10, 07:49 PM Thread Starter
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Location: Kelowna, BC, Canada
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Gen lite stays ON in my 67

Hi there,

I picked up a 67 machine that has been rewired and it came with the alternator busted due to previous owner splitting the case and turning it a quarter turn to fit again the BBC valve cover. I replaced that bad alt with both a new alt and regulator.

The gen light stays on and it's not charging. I yanked the new alt and regulator out and brought them to another shop for testing and they're both fine. But yet it's not charging and the gen light stays on.

The voltage regulator shows juice with a test light at the orange and brown wires (with ignition on, engine off). The white and blue wires from regulator to alt are fine as I ohmed them out.

I'm stumped. I gather there's something at the ignition key/dashboard end of things to complete or resist a circuit in order to "turn on" the alt?


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post #2 of 3 (permalink) Old Mar 22nd, 10, 08:46 AM
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Re: Gen lite stays ON in my 67

sounds like the ign side is good. The only thing left is to check alt and reg grounds and alt hot circuit. Make sure grounds are good and take a volt reading when car is running at the alt pos post.
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post #3 of 3 (permalink) Old Mar 27th, 10, 12:04 PM Thread Starter
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Location: Kelowna, BC, Canada
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Re: Gen lite stays ON in my 67 - always have a spare regulator handy!

One thing I learned this time around was to have a spare voltage regulator handy. Even though I had taken the old voltage regulator along with alternator to the shop for testing and both tested good. So, it got to the point where I took the car in to the shop to finish it off and I told them I felt it was the regulator. The techie spent over half an hour testing wiring and full field testing, took the regulator out for another test and it showed good! Then he kind of gave up, his boss came in and told him to try another regulator just to see....and man, it worked! Even when the old regulator tested good on the bench and in the car, but there was something pulsing in it. If only I had a spare regulator handy I would have followed my instincts and saved a trip to the shop.

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