Well, I'm stumped (charging light always on) - Team Camaro Tech
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post #1 of 4 (permalink) Old Jan 16th, 10, 08:31 PM Thread Starter
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Ed
 
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Well, I'm stumped (charging light always on)

About 10 years ago I converted my 68 from an externally regulated alternator, to a 10SI internally regulated alternator. For 10 years, it's been a workhorse.

My son was driving the car this morning, and the charging light came on. I had him bring the car home and after a quick diagnosis, it appeard the alternator was only putting out 13 volts. So we took it to Kragen and they tested it and it PASSED!! So I took it across the street to Auto Zone, and it passed there too.

So after we got back home, I started looking for problems and couldn't find anything wrong in the circuit. All the wiring ohmed out okay and there weren't any grounding issues, so I went back to Kragen and told them I believed that the alternator was bad anyway. Well, I have to admit that they didn't say boo when I told them I wanted to get a new one under my original lifetime warranty. They said no problem and handed me a new (rebuilt) 10SI alternator.

After installing it, I started up the car and the charging light still came on! So now I'm totally at a loss as to why this is happening.

Does anyone have any ideas?

Ed


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post #2 of 4 (permalink) Old Jan 16th, 10, 08:50 PM
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Re: Well, I'm stumped (charging light always on)

Measure both sides of the GEN light.
IGN on one side, battery; alt on the other if running.
Unless the two inside wires of the OE ext connector came loose.
Wiring diagram of your hook-up for internal reg alt?

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post #3 of 4 (permalink) Old Jan 17th, 10, 03:48 AM
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Re: Well, I'm stumped (charging light always on)

my previous 67 camaro had a cut up wire harness and I repaired it the best I could and everything worked but the GEN light never would go off I drove the car for several year's never had a problem but that light was alway's on ?

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post #4 of 4 (permalink) Old Jan 17th, 10, 01:18 PM Thread Starter
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Re: Well, I'm stumped (charging light always on)

It's a mystery... I fixed it, but I'll be darned if I know what was wrong!

Ohmed out the wires again and nothing was out of the ordinary. Checked for grounded wires and none were found. So I started running external (out of the harness) jumper wires to troubleshoot. When I ran a jumper from the alternator ("Field") to the indicator lamp inside the car, the problem went away! So whatever it was, was related to the "Field to lamp" wire.

Oh well, it's another one of those electrical gremlins we're always running up against in old cars.

Ed


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