wiring help
Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
wiring help
The PO I got this from apparently liked cutting wires as you can see. The harness seems to go behind the pass side of dash but I have not located where it ends but hoping some guru here may be able to tell me where it starts and ends.
Blower motor does not work and I am hoping that this would be why.
Senior User
Joined: Feb 2014
Posts: 271
Likes: 0
From: Bakersfield
Cool, you also get the fun of repairing a PO's butchered wiring loom. Just waiting on one last pigtail, should be here today, to finish mine.
These were invaluable in the project.
Ford Truck Technical Drawings and Schematics - Section H - Wiring Diagrams
Good luck and have fun with it, gives you a chance to really clean up under the dash and under the hood.
These were invaluable in the project.
Ford Truck Technical Drawings and Schematics - Section H - Wiring Diagrams
Good luck and have fun with it, gives you a chance to really clean up under the dash and under the hood.
Senior User
Joined: Feb 2014
Posts: 271
Likes: 0
From: Bakersfield
71 not listed....must be because you are the first new owner of a 71 that had the PO tear into the wiring. Wow, just lucky I guess, every other truck from every other year has been butchered 
Bet you can use the 70 and 72 to compare diagrams to see if they are the same. Chances are if 70 and 72 match, 71 was the same.
When I did mine, I removed it from the truck, unwound all the tape that was on it, found what had to be repaired/replaced, noted wire color combinations, then went to the junkyard, opened up a nice newer, unbutchered harness, made sure it had all the color/stripe cmbinations I needed, removed it, keeping maximum length.
Went up to pay for it, the guy says, no one ever buys the wire harness, just take it. Of course, I did have a few other parts, which may be why he tossed it in.
Was real easy redoing the harness in this way, got everything fixed and all recovered and works great.
Bet you can use the 70 and 72 to compare diagrams to see if they are the same. Chances are if 70 and 72 match, 71 was the same.
When I did mine, I removed it from the truck, unwound all the tape that was on it, found what had to be repaired/replaced, noted wire color combinations, then went to the junkyard, opened up a nice newer, unbutchered harness, made sure it had all the color/stripe cmbinations I needed, removed it, keeping maximum length.
Went up to pay for it, the guy says, no one ever buys the wire harness, just take it. Of course, I did have a few other parts, which may be why he tossed it in.
Was real easy redoing the harness in this way, got everything fixed and all recovered and works great.
Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
That would be great if these year trucks were plentiful down south here. Unfortunately no where here on the coast have any this style and year so I will have to resort to internet searching. I wish the wiring schematics were a little better when tracing color wires either that or I just have difficulty deciphering whats what.....probably the latter.
Senior User
Joined: Feb 2014
Posts: 271
Likes: 0
From: Bakersfield
The harness does not have to be from your year, just needs the right color wires in it. Then you can either splice in the missing pieces, or, go to a place that sells small electrical parts, get the proper new wire ends, solder them on and remove the old one from the multi plug it goes into, and just insert the new one.
When all are repaired/replaced that need to be, choose the type of covering for the harness that you want to use, get it all nice and tidy and reinstall it. Or spend hundreds of dollars for someone else to do what you can do yourself on a Sunday.
When all are repaired/replaced that need to be, choose the type of covering for the harness that you want to use, get it all nice and tidy and reinstall it. Or spend hundreds of dollars for someone else to do what you can do yourself on a Sunday.
Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
I agree with you about not having to be my year but only years I have found are 80's and up. Not sure if they will be the same since they are differnt body styles. I will for sure be doing it myself though. I hate paying for stuff I can do myself.
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Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
After tracing the wires between fire calls I was able to find the wire went through the dash and under the ac unit, through the firewall on pass side and then went across to drivers side and down to frame rail towards the back where it was cut off there also. I am leading to that it is an aftermarket wiring that the PO had installed for something. Inside the bundle of wires was a thread that you can use to cut the sheath to gain access to the wires that I am not sure they had in the 70's. If this is true than I should be able to get a sending unit for the instrument cluster and reconnect everything and get rid of the aftermarket one that was hooked up. Hopefully the dash gauge works.
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Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
I have another question......my truck has the explorer package with the ac unit. Blower is not working...in the fuse box there is a 20A spot that I believe is for heater/blower motor and its blowing the fuse. I found the relay for the diff speeds for the blower motor but there are 2 diff plugs and I cant find the exact schematic for this ac unit(I have looked on fordification), does anyone know which one is for the power for the blower motor so i can put power to it to see if it works or it may be the switch. I will try and take some pictures so you can see what I am.
Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS
Ok....next question!!! I got the truck running and decided to take it for a test drive and noticed the ALT light was on. Now I had to jump the truck off cause the battery was weak. I did take the positive terminal off the battery to see if the ALT was doing its job and it stayed running so.... I get back from the test drive and pop the hood and come inside to look up on the wiring diagrams to see what should be there. I find on the truck that all I have is 2 wires going to the back of the alternator. ! wire coming from the hot side of the solenoid and a ground wire coming from the battery..thats it. I look at the voltage reg and it is plugged up but also a taped up bunch of wires (see attached pics of wires). I am guessing this may be a newer alternator because there are no places to hook these wires to? Im a little lost. Please help.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
That looks like a GM alternator. Does this help?
GM 3 wire alternator idiot light hook up
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GM 3 wire alternator idiot light hook up
<HR style="BACKGROUND-COLOR: #666666; COLOR: #666666" SIZE=1 itxtNodeId="364"><!-- / icon and title --><!-- message -->
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
or this
as for wiring it up you'll have to remove the rectifier from the battery circuit and you'll need to use the dashboard battery light to provide some load for the alternator switching circuit
this is is a typical alternator wiring circuit - ignore the t2 connection for your purposes
as for wiring it up you'll have to remove the rectifier from the battery circuit and you'll need to use the dashboard battery light to provide some load for the alternator switching circuit
this is is a typical alternator wiring circuit - ignore the t2 connection for your purposes
Thread Starter
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Laughing Gas
Joined: Jan 2013
Posts: 1,016
Likes: 4
From: Gulf Coast, MS