3G wire Help
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Senior User
Joined: Jan 2012
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From: Texas
3G wire Help
Alright I got my Alt installed got is tested prior and 100% good. I got it wired all up according to the diagram in a couple post tossed the old harness and meter. I have Zero power. I checked my wires with a volt meter and got 12.4 v on my solenoid but nothing when I try to turn it over. I did have to ground my alt where the bottom bolt holds the alt in place, cause the small bolt I used behind the alt stuck out too far and wouldn't fit. Could my issue be with the ground how I did it? It's a 71 F-250 360cid.
followed this diagram
http://www.fordification.com/galleri.../3Ginstall.jpg
followed this diagram
http://www.fordification.com/galleri.../3Ginstall.jpg
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
I don't think it is a grounding issue. The 3G is physically grounded through the casing, bracket, the water pump, to the block.
You may have popped a fusible link or ya mis-wired the thick Black/yellow wire. I'd pull the alternator harness and Ohm it out to verify continuity.
The harness should look and function as pictured below (ignore the text for the ammeters):
You may have popped a fusible link or ya mis-wired the thick Black/yellow wire. I'd pull the alternator harness and Ohm it out to verify continuity.
The harness should look and function as pictured below (ignore the text for the ammeters):
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Dude, you're the first....Click on the image and it will enlarge to 640 x480 - readable.
You mean where it connects to the solenoid? Peel back the wrap and it'll likely be the Blk/yel and Yellow wires or it has an inline fusible link. Sometimes the colorant wears off. Regardless, it needs to be connected to the battery side terminal.
The Y/wh from the 3G also connects to the hot side or looped to the alternator's battery lug. The Gr/r wires need to be connected to each other.
The Y/wh from the 3G also connects to the hot side or looped to the alternator's battery lug. The Gr/r wires need to be connected to each other.
Fleet Owner
Joined: Dec 2009
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From: NorCal
Increase your screen's resolution. 'You using a "mobile device"?
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From: Texas
on my PC and Phone its the same, it doesnt help when your color blind either. and no not black and white color blind lol
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Senior User
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From: Texas
i think my mistake was putting the black/yellow wire on the starter side of the solenoid. I took the bolts and washers off the starter and used a wire brush to clean up the connection too.
Elder User
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I finally got mine going no noise but others have because of using a single v pulley. If you go to a double v you should get rid of the squeal. Double v puleys are available at auto parts stores, online and the junkyard.
Posting Guru
Joined: Mar 2006
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correct- the solenoid is an open switch except when you're cranking the engine over, so the black/yellow wire would not have been getting battery voltage.
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Senior User
Joined: Jan 2012
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From: Texas
well i tightened it some more to day and it still squeals.
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