different cab wiring help
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different cab wiring help
I have a truck i just got with a 1974? f150 frame and 300 inline 6 manual 4 speed with granny gear (PO said non-ac)
It now has a 1978 f350 v8 auto cab with a/c.
The wiring is a little mixed between the 2 and i'm not sure if i can decifer colors/tracers anymore.
It needs a new battery and some fused link wiring
I know it needs an ignition module.
I have a few rebuilt 3g alternators i'm looking to put one on.
Is there anything not compatible? If i follow one wiring diagram or the other will i fry something?
I know i'm an arm chair mechanic right now, but i want some do's and don'ts before i ruin the truck. thanks in advance
It now has a 1978 f350 v8 auto cab with a/c.
The wiring is a little mixed between the 2 and i'm not sure if i can decifer colors/tracers anymore.
It needs a new battery and some fused link wiring
I know it needs an ignition module.
I have a few rebuilt 3g alternators i'm looking to put one on.
Is there anything not compatible? If i follow one wiring diagram or the other will i fry something?
I know i'm an arm chair mechanic right now, but i want some do's and don'ts before i ruin the truck. thanks in advance
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
The '74 and '78 modules don't interchange. '74 was a one year only version.
It's easy to tell which you have. Look at the plastic grommet that surrounds the wiring where it enters the ignition module, if its blue, you have the module for the '78.
That's how the modules are identified, by the color of the grommet. The blue is the best and most common.
I can't remember off hand but I think the '74 grommet is black.
Tuned
Joined: Apr 2015
Posts: 345
Likes: 25
From: Michiana
The '74 and '78 modules don't interchange. '74 was a one year only version.
It's easy to tell which you have. Look at the plastic grommet that surrounds the wiring where it enters the ignition module, if its blue, you have the module for the '78.
That's how the modules are identified, by the color of the grommet. The blue is the best and most common.
It's easy to tell which you have. Look at the plastic grommet that surrounds the wiring where it enters the ignition module, if its blue, you have the module for the '78.
That's how the modules are identified, by the color of the grommet. The blue is the best and most common.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Why is the blue one the best??? I have an off road vehicle that has no top end. It is running really bad right now. I am not sure if it is fuel or ignition related. It is running the blue module. Was thinking of replacing it or tearing down the carb. Which should probably be done anyway. Last year it was getting rough and now it is really bad.
If you do replace it, spring for the extra money and get either genuine Ford or genuine Motorcraft. The cheaper imports have a very high failure rate.
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