alternator problems continue - Team Camaro Tech
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post #1 of 4 (permalink) Old May 25th, 06, 10:58 AM Thread Starter
 
Join Date: Apr 2005
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Question alternator problems continue

With the car running, The alternator light (idiot light) remains very dim and the voltage on the battery is about 12, appears it is not charging. I checked the blue wire that connects to the alternator and it had 9.2 volts and the white wire had zero volts. What next?
I do have an external regulator, 80 amp alternator and a new voltage regulator.
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post #2 of 4 (permalink) Old May 26th, 06, 01:47 AM
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Re: alternator problems continue

Could be the alternator is bad as its not feeding any voltage to the regulator on the white. Try the tests below...


This was written by another member, a very good write up on how it works and how to troubleshoot a externally regulated charging system.
Quote:
Originally Posted by Peter F
I dug this out from before, hopefully it help. If not, just post or send me your questions.

I'll try to provide a simplified explanation of how the externally regulated alternator and regulator work here. This explanation starts from a parked car with engine off state.

The regulator brown #4 wire is connected through the light bulb to 12V whenever the key is in the ON position. The other end goes through a set of points in the regulator and then out the F terminal to the field winding in the alternator. So some current begins flowing in the field winding from this connection. The little bit of current flowing produces a weak magnet field in the alternator and also lights the bulb.

When you then start the car, the weak magnetic field from above begins rotating which makes the alternator producing a little bit of voltage. This voltage is fed from the alternator to the regulator on the white regulator #2 wire. This wire connects to a coil in the regulator and turns on a contact when the voltage goes above 3.2V.

Once the contact turns on in the regulator the #3 and #4 terminals are connected together. Terminal #3 is battery power so this puts battery power on both sides of the bulb and turns it off. This means the brown #4 wire should go to +12V. Also, this connects the field terminal right to battery power but still going through the points.

When the battery voltage goes above a set level, the F terminal is disconnected from the battery power by the points I kept mentioning. Then the voltage drops and the points close again. This on-off cycling happens rapidly and is how the voltage gets regulated.

From the above (KOEO = key on engine off and KOER = key on engine running).
F or #1 terminal (field) - KOEO = #4 slight voltage, KOER = 9-12V typically
#2 terminal (sense) - KOEO = 0V, KOER = >3.2V
#3 terminal (Battery) - KOEO = 12V, KOER = 12V
#4 terminal (light) - KOEO = F slight voltage, KOER = 12V

By 12V above I mean battery voltage, which may be 12V when engine is off but could be up to 14.5V when engine is running.

Check the light: Ground the brown #4 terminal wire at the regulator. When grounded the light should come on. If you don't have a light then skip this test. Test this with the connector off the regulator.

Checking the alternator: Jumper the blue wire F terminal to the battery post on the back. This should make it easily crank out 16+ volts. Next, connect a troublelight between the battery post and the F terminal. The light should come on and you should measure > 3.2V at the other alternator terminal. If it passes these tests, then it's in the regulator or wiring.

Checking the wiring: At the regulator connector jumper the brown light wire (#4) to the F terminal (#1) and you should be able to measure >3.2 volts on the other alternator terminal or terminal #2 of the regulator connector. If these tests pass, it is in your regulator.

When doing these tests, make sure you turn off or pull the fuses for any added electronics that you can. The alternator test can produce enough voltage to damage stuff.

Peter

Greg U

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post #3 of 4 (permalink) Old May 27th, 06, 06:29 PM Thread Starter
 
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Thumbs up Re: alternator problems continue

FINALLY GOT IT!!!!!!!!
When I added the big block (newer engine) and the alternator is on the passenger side and on a 68 the alternator was on the drivers side. the original wiring harness had to be added to so the alternaor wires would reach the passenger side. I got the wires crossed and that is what my problem was. Thanks TEAM CAMARO for all the help!!!!
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post #4 of 4 (permalink) Old May 27th, 06, 10:45 PM
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Re: alternator problems continue

Wires crossed would do that. Thats not a common problem as the factory connector goes in only one way. Glad you fixed it.

Greg U

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