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Old 02-10-2010, 09:27 PM
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Alternator Problem on 86 mc

Hello i have a minor problem on my 86 monte carlo ss. I have a alternator that doesn't keep my car running. Wen i take of either terminal the car shuts offs i changed the alternator 3 times still nothing. i need any other alternative to the problem. What could be the cause of that.? Plz help

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Old 02-10-2010, 11:28 PM
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I really have no clue but im guessin its a wiring issue.Sorry i cant be of more help.
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Old 02-11-2010, 08:45 AM
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Quote:
Originally Posted by McSS86
Hello i have a minor problem on my 86 monte carlo ss. I have a alternator that doesn't keep my car running. Wen i take of either terminal the car shuts offs i changed the alternator 3 times still nothing. i need any other alternative to the problem. What could be the cause of that.? Plz help
You need to check the wiring to the alternator. You may have a broken wire or a bad ignition switch etc.

I am going to assume it has a GM 10SI alternator. With the car running you should have voltage at the 2 smaller wires and the large post on the back. The #1 small wire is the exciter wire that comes through the dash light usually, the #2 wire is the sense wire, this is tied to the electrical system usually near the fuse box to tell the regulator what the system voltage is. The large stud on the back it the output. My guess is the exciter wire on your car is broken or disconnected. With the key on pull the small connector and check the wires for voltage. Continue troubleshooting from there.
A wiring diagram will be your friend.

Also once you do get it charging DO NOT REMOVE THE BATTERY CABLES WHILE IT IS RUNNING. This is the easiest way to ruin an alternator and could alos cause a battery explosion.
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Old 02-21-2010, 01:12 AM
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with key on all the wires on the alt except the small wire should be hot 12 v

the biggest spade terminal wire on the side of the case, and the red wire to the charging post should be straight to battery hot all the time, key switch off even
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