Need Help With Wiring ID
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
Need Help With Wiring ID
Can anybody tell me which wires go to/do what and when/if they have power? I have a few figured out from the Chilton's manual and my ford manual doesn't have any schematics.
It plugs into here and runs to the engine.
It plugs into here and runs to the engine.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
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They go to your truck! 
Sorry.
You know, I started to write that down when I re-wired mine, but it never got finished.
All I can tell you off hand is the fat yellow wires go from your starter relay hot side to your glow plug relay and they are hot all the time.
Dave S had a breakdown of most of the wires, you might want to search his posts.
Sorry.
You know, I started to write that down when I re-wired mine, but it never got finished.
All I can tell you off hand is the fat yellow wires go from your starter relay hot side to your glow plug relay and they are hot all the time.
Dave S had a breakdown of most of the wires, you might want to search his posts.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
Ah, found it, this was helpful when I put the 7.3 into the '85, I had to graft the two harnesses together:
https://www.ford-trucks.com/forums/8...ml#post8098024
In fact, I think I'll stick it in the FAQ.
https://www.ford-trucks.com/forums/8...ml#post8098024
In fact, I think I'll stick it in the FAQ.
New User
Joined: Mar 2014
Posts: 15
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From: Nashville, TN
I know that blue wire at least on my 88, I just dealt with that sucker yesterday I had broken it accidentally when changing out my valve cover gasket, It took me hours to find it because it was broken off right next to the connector. I believe it is coming from one side of the 'wait to start light' the other side, at least on my truck, was connected to the ignition terminal on the glow plug relay. Now I'm not positive this is the way things are supposed to be but at least it got things working for me.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
I know that blue wire at least on my 88, I just dealt with that sucker yesterday I had broken it accidentally when changing out my valve cover gasket, It took me hours to find it because it was broken off right next to the connector. I believe it is coming from one side of the 'wait to start light' the other side, at least on my truck, was connected to the ignition terminal on the glow plug relay. Now I'm not positive this is the way things are supposed to be but at least it got things working for me.
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