Voltage Regulator/Horn Relay/Small Black Cylinder?? - Team Camaro Tech
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post #1 of 2 (permalink) Old Sep 13th, 05, 08:41 PM Thread Starter
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Join Date: Aug 2005
Location: Raleigh, NC
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Voltage Regulator/Horn Relay/Small Black Cylinder??

Hello again!

Well, I attempted to correct the major grounding issues on my new paint job, and looks like the charging system is non-operational now. Dead battery city!

While the car was still operational, I was seeing very high voltage, 18+V at high RPMs. Also, car would occasionally *click* once when attempting to start. A few turns of the key in the ignition back and forth, then I'd get the starter motor to turn with normal ignition.

I monkeyed with the voltage regulator, attempting to get a better ground, but may have (well, definitely have!!) screwed the charging system.

Here's where I'm at now:

Gen light still illuminates with Key on.
After jump, car runs fine, but only reads 8-10V on gauge.
Gen light goes off after starting engine (with jump).
Lights intermittently work - Maybe one, maybe both, sometimes only on high beam.

Any ideas? Also, I notice a small black cylinder, the size of a thumb, mounted on the horn relay with a strap. It has a small black wire, maybe #18 in size, that (currently) connects to the side of the voltage regulator. This is not on the wiring diagram!!! What is this thing??

Looking for any assistance to get my 69 running properly again!! If it helps, I can get a picture posted. Thanks!
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post #2 of 2 (permalink) Old Sep 14th, 05, 04:41 AM
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Location: Va Beach VA
Posts: 31,853
Re: Voltage Regulator/Horn Relay/Small Black Cylinder??

The cylinder is a noise supressor and the clamp goes around the body and the lead gets attached with the large red wire with the fusible link on the reg harness plug. Don't forget to measure conductivity of the wire to make sure the fusible link is good.

The reg body gets grounded by a pigtail from the regulator base to rad support. Make sure there is a star washer between the electrical lug and body steel to make sure it gets good contact.

The battery gets charged by the large pair of red wires on the horn relay. Usually, the buss bar becomes corroded and needs cleaning. One of the two wires goes across the rad support to a junction block by the battery, then ties in with the positive pigtail on the pos battery cable. Make sure all of these connections are clean as well. The battery ground cable gets attached to the engine on a clean spot and the pigtail gets attached via a star washer on the fender. Clean and good contact.

The headlamps are grounded via black wire pigtail to rad support. Again, star washer between lug and support and a clean connection.

Once engine is running, measure from bat neg terminal to alt case to ensure alt case is grounded, voltmeter will show less than 0.4 volt if connection of grounds are good. Measure from BAT terminal on alt to bat positive post to ensure less than 0.4 volt. Anything more means a high resistance connection from alt BAT terminal to bat post.

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