What do I look for now? - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 26 (permalink) Old Jun 3rd, 18, 9:04 PM
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Joe
 
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Re: What do I look for now?

Duke,

You’ll be using your voltmeter to do some basic checking first.


With the car OFF...unplug the 4 wire connector from the regulator.

Touch your black probe to a good clean metal ground. Keep it there.

Now you will be moving the red probe from connection to connection.

With the voltage regulator connector in your hand....

Position 1 or “F” (blue wire) should have Zero volts on it.

Position 2 white (may look yellow due to age) should have zero volts on it.

Position 3 orange should have battery voltage on it.

Position 4 brown should have zero volts on it.

If anything isn’t right, report back FIRST.

If that’s ok, then turn the key to the “on” position, but don’t start the car.

The #4 wire (brown) should have battery voltage (or very close to).

Is this what you have so far?
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post #17 of 26 (permalink) Old Jun 4th, 18, 12:29 PM Thread Starter
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Duke
 
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Re: What do I look for now?

Thanks for chiming in, Joe! Here's what i have based on your tests: Bat. voltage is 12.6. In the first group of tests terminals 1-3 show 0 volts and the brown wire shows battery voltage. With the key "on" the brown wire shows varying voltage from 7-ish to 9-ish and jumps around a lot. What next? Oops..should have said that in the first test, the org. wire is bat. voltage and the brown was 0. Sorry! Second test is correct.

Last edited by DUKE 69; Jun 4th, 18 at 12:32 PM. Reason: error in wire colors
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post #18 of 26 (permalink) Old Jun 4th, 18, 10:00 PM
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Joe
 
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Re: What do I look for now?

Hey Duke,

The only thing that concerns me is the #4 brown wire with the key on. It should really be closer to battery voltage then 7 to 9 volts and shouldn’t be jumping around. Perhaps your meter probe didn’t have the best connection on the terminal? Are the terminals in the 4 wire plug clean and free of corrosion?

With the key “on” without the car running, you can take a jumper wire and connect one end of the disconnected regulator plug ( to the brown #4) and the other end of the jumper wire to a good clean ground. Not only should the “GEN” light in the dash come on, it should be as bright as the other dummy lights. Verify this.

Before we check running voltages with the regulator connected, check these items first:

The frame of the regulator is tightly mounted to the front sheet metal directly. The regulator frame needs a good clean ground.

The battery (-) terminal should have a small pigtail running to the front sheet metal to ensure the body has a good ground connection.

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post #19 of 26 (permalink) Old Jun 5th, 18, 7:58 PM Thread Starter
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Re: What do I look for now?

OK Joe, got a better connection with the probe and got 11.67 v at the brown wire with key on. Grounds are good (everything worked fine last season also.). So what's next? I'm learning as we go so thanks for your patience.
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post #20 of 26 (permalink) Old Jun 6th, 18, 6:44 AM
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Re: What do I look for now?

Quote:
Originally Posted by DUKE 69 View Post
OK Joe, got a better connection with the probe and got 11.67 v at the brown wire with key on. Grounds are good (everything worked fine last season also.). So what's next? I'm learning as we go so thanks for your patience.
Dig in those deep dark pockets and replace that 6 year old battery.
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post #21 of 26 (permalink) Old Jun 6th, 18, 8:24 PM Thread Starter
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Re: What do I look for now?

I may end up there yet, Mike but want to exhaust any other possibilities also. Do not want the Mrs. to get stranded somewhere!
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post #22 of 26 (permalink) Old Jul 1st, 18, 10:33 PM
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Quote:
Originally Posted by DUKE 69 View Post
I may end up there yet, Mike but want to exhaust any other possibilities also. Do not want the Mrs. to get stranded somewhere!
Duke did you figure anything out yet? I'm replying on my phone, so if this looks odd, it isn't ME! Hahah

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post #23 of 26 (permalink) Old Jul 2nd, 18, 6:38 AM Thread Starter
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Re: What do I look for now?

Yes Mark, I 'think" I have it now. I ended up replacing the alternator with one that is internally regulated and that seems to have solved the problem...at least for now. Just got it done over the weekend (too much other stuff going on around here!). Road test on Sat. went well so we shall see. There may be "something" in the harness that messed up things but for now, I'm good. Meant to follow up on this thread last night but forgot (must be the heat). Thanks to all for the suggestions and especially Joe (Coppertop) for his patience and advice.
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post #24 of 26 (permalink) Old Jul 2nd, 18, 7:12 AM
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Re: What do I look for now?

Coppertop's the MAN!

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post #25 of 26 (permalink) Old Jul 2nd, 18, 1:35 PM
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Re: What do I look for now?

Quote:
Originally Posted by DUKE 69 View Post
Yes Mark, I 'think" I have it now. I ended up replacing the alternator with one that is internally regulated.
Is it a one wire alternator, or did you change the wiring?

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Engine parts: (Heads, cam & lifters from Lewis Racing Engines)
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AFR 305 CNC 106cc Chambers 8002 springs
Bullet HR ADV Dur 295/297 238/242 @ .050 .680/.650-110 LSA-108 ICL Morel lifters
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612HP/594TQ
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post #26 of 26 (permalink) Old Jul 2nd, 18, 8:45 PM Thread Starter
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Re: What do I look for now?

It's a one-wire set-up, Mark.
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