Alternator question
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Post Fiend
Joined: May 2006
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From: Central Florida
Alternator question
On a 3g/6g alt, there is a harness of three wires and a charge wire. Looking over my manuals, There is a jumper wire, if they were in the same harness, it should have been done internally. So I believe there is a connection from the charge wire back to harness. Is that right?
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Post Fiend
Joined: May 2006
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From: Central Florida
Well I pulled the alt loose again. Two wires run into the pigtail and one is bolted to back of the alt. Two alternators so far, one old and one new. Neither produce a charge at the batt, pos batt and alt case, alt case and alt bolt. I did notice my volt meter fluctuate .03 volts up when I reved the motor. So either one of the wires is cut/disconnected or my truck has a gift for blowing regulators. What do the outer most pins on the harness do? My harness is different from the 90, so I imagine that blk/org and yel/wht are the charge wires. one goes to the cluster, so does the other connect back to the battery?
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Post Fiend
Joined: May 2006
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From: Central Florida
I turned the key on, walked around to the alt and tapped the back of it with a file for 10 seconds. I never felt a magnetic pull, so Which wire provides 12v for the field coil?
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Post Fiend
Joined: May 2006
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From: Central Florida
Both wires in the harness have battery voltage and very low ohms. The alt ground is ok. is there a way to test the alt without a bench tester.
Plus both charge wires have a good connection.
Plus both charge wires have a good connection.
Last edited by ReAX; Sep 30, 2006 at 12:45 PM.
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Post Fiend
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After a lot of research and seeing very diagram show a cluster light, I have decided this is a new symptom of my cluster, KSM issues. I guess I am going to the dealership next week.
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From: Virginia
Does the above diagram match your wiring?
1. You should have your large wire for the output of the alt(I think you are calling this the charge wire). It's the black orange wires.
2. You should have the yellow/white wire. This is the feedback wire. It sends the system voltage back into the regulator, so the regulator knows how much to tell the alt to charge.
3. You should have the green/red wire. This wire should have voltage on it when you turn the key to run. This brings the alternator "online" so it will charge, and takes it "offline" so it will not run the battery down whe the engine is not running.
4. You should have the white/black jumper.
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Post Fiend
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From: Central Florida
No. Mine is a 6g. I have a large yellow (and red 1/0) charge wire that is bolted to a stud on the back of the case. The voltage regulator has two wires, one blu/org and one org/ylw I think. All of which tie back to the battery with the ign off. No jumper and the fusible links are inches from the battery and turn into a red wire.
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Post Fiend
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From: Central Florida
Any clue on how to activate the regulator? I haven't tested yet if the connections change with the key on, but what I have seen so far is the cluster light has to draw on the regulator.
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Post Fiend
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From: Central Florida
org/blu is closest to the charge stud and is connected to the battery. Grn/Red is the field wire and furthest from the the stud.
This afternoon, not touching it for 24hrs. The Grn/Red wire had .03volts and org/blu had battery voltage. KoEo both wires had voltage, but the grn/red was less than the org/blu meaning it has draw with the key on. This tells me the truck is fine. I'm charging the battery back up (10.3 volts currently) and I'll check it out again in a little while.
This afternoon, not touching it for 24hrs. The Grn/Red wire had .03volts and org/blu had battery voltage. KoEo both wires had voltage, but the grn/red was less than the org/blu meaning it has draw with the key on. This tells me the truck is fine. I'm charging the battery back up (10.3 volts currently) and I'll check it out again in a little while.
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From: Virginia
We started out on the wrong foot here. I was basing all responses to your questions on the above diagram, which I believe is a 3g diagram.
Let's start over.
You have a 2002 f250 correct? And you are retro-fitting a 6g alternator on it? Do you know what vehicle the 6g came standard on?
Let's start over.
You have a 2002 f250 correct? And you are retro-fitting a 6g alternator on it? Do you know what vehicle the 6g came standard on?