3 wire alt help - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

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post #1 of 8 (permalink) Old Jul 25th, 18, 01:25 PM Thread Starter
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John
 
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3 wire alt help

My has an external regulator and is not charging the battery. I was going to remove the alternator and have it tested. But when I went to remove I notice what I determined to be the ground wire, was not grounded, it was just hanging there. I assume that is enough to keep it from charging the battery.


I went to pull it out to length to determine where it grounds, but it broke off. So I need to buy/make another ground and I need someone to tell me where exactly it grounds at. It was about 5" long and green. Any help is appreciated. I would prefer to purchase a ground wire verses making one. So any recommendations on where I can buy is appreciated too.


Thanks,
BH

Last edited by BigHog; Jul 26th, 18 at 03:49 AM.
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post #2 of 8 (permalink) Old Jul 25th, 18, 04:46 PM
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Re: 3 wire alt help

I never ground my alternator (maybe I should) but I figure the mounting bracket and the adjusting arm is good enough. So I don't think that is your problem. A ground wire is usually black

1967 Camaro: True RS, Tribute SS, 350 290 HP, Muncie M20 4 SP, 12 Bolt Posi
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post #3 of 8 (permalink) Old Jul 25th, 18, 04:49 PM
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Re: 3 wire alt help

Picture of your dilemma? Year?
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post #4 of 8 (permalink) Old Jul 26th, 18, 02:43 AM
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Re: 3 wire alt help

i had my brackets and alternator cerakoated . when i installed them it wouldn't charge. so i ran a small wire where the bolt goes through the alternator to the block and to the block where my battery ground attaches
problem solved
try just using a jumper wire attached to the battery and touch the alternator and see if it will charge be fore going to the trouble posted above
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post #5 of 8 (permalink) Old Jul 26th, 18, 04:16 AM Thread Starter
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Re: 3 wire alt help

Thanks everyone. Hopefully it stops raining long enough here, so I can go and take pictures and try what has been suggested. By the it's a 1968 w/327.
BH
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post #6 of 8 (permalink) Old Jul 26th, 18, 06:29 AM
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Re: 3 wire alt help

Okay, correct year and OE alt design has three wires
Blue & white for field winding, and red wire on BATT post.
No grounding wire as mounting in bracketry should ground the case.
Green wire could be from cylinder head temperature sender as it is, or could be, between Cyl's 1 & 3.
If not charging, voltage measurements across battery posts and BATT post to alt case should be within 0.2 volts of each other.
Tip: On horn relay buss bar, remove red wires and wire brush them and place red wires onto the same screw on buss bar.
At battery junction block next to battery, follow positive cable pigtail, disassemble wires, wire brush terminals, and reassemble.

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post #7 of 8 (permalink) Old Jul 26th, 18, 08:50 AM Thread Starter
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Re: 3 wire alt help

Caveat: My car will never make ROTM in the foreseeable future. Mine is more inline with Roadkill. I want to get her on the road, have fun and add to her over time. That being said the sponsors should really orient some kind of contest for cars like mine. We need the parts and cash to keep the build going. Also the pictures are the best I could do with my phone.

First picture - 327 engine. I know not pretty, but she runs just fine.

Second pic - Now that I can see better with some rare sunlight today, the wire broke off a condenser/capacitor. I'll replace that, but not sure where it grounded to. I suspect this would have no impact on the charging system.

Third pic - So I noticed the positive wire was loose, or so I thought it was. I pulled the boot back and the wire is tight to the terminal/post, but the terminal/post is loose and moves back in forth in the alternator. Time for a new alternator?

Thanks!
BH
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post #8 of 8 (permalink) Old Jul 26th, 18, 10:02 AM
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Re: 3 wire alt help

you can take your alternator to a shop and have them tighten that lug up
I just did that on one of my units and was charged $5.
while they have it apart then can do what else needs to be done to make it new
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