Can someone tell me if the engine bay wiring harness from a 92 F250 and a 93 F150 are the same? My truck is a 92 F250 and the wiring harness is in pretty bad shape. Lots or wires cracked or insulation cut, corrosion showing in multiple places etc. I know the 94 is different and I believe the 91 is too so I can't use them.

The truck I'm looking at is a 93 and the wiring looks like it's the same and, if I remember right, it's also a 5 speed and 4X4 like mine. Both trucks have a V8 although mine has the 460 and the F150 has a 351W.

 

My chilton showed the same diagram for a 5.8 E4OD for 92/93 so maybe so. Check a chilton, hayness, or any other diagram to see if it was different. Might be a bit different at the alternator if it came from a truck with the early model 3G. I see your sig states you have a 92 converted to 3G so probably not an issue. Anything shown on the same, even if generic diagram, should be able to be made to work.

 

You're only going to get close with this so if the harness is in good shape I say grab it, the only harness that would be a guaranteed direct swap would be one from another '92 with a 7.5L. You need a V8 engine harness with the same bulkhead connectors as yours which could be only a 2 year wide window... possibly '92 and '93 only, then it's a guarantee there will be pinout differences at the connectors that you have to sort out and the layout for some devices will have to be changed if you are trying to make a 5.8 harness work, for example EGR is front pass side on the 5.8 while it's rear drivers side on the 7.5. And whatever you do don't buy a harness from a MAF truck or one with OBD2 it's much different.

 

Thank you CamoF-250 and Conanski. If everything checks out I feel pretty good about taking this harness and making it work. I will have to reconfirm the truck is a five speed. I know it won't work (at least with my level of knowledge and skill) if the harness is from an automatic or from a 94 and up. I know the truck is an OBD1 truck as it has the same test plug in the same location as my 92 however I will make sure it's an SD truck before I take the harness.

Can a 93 be a MAF system? I thought only 95 and up were MAF?

 

mid 94 and later150's with 5.0's were usually MAF,
from what I've found around here...
everything else OBS
(even a late-96 250 with a 351w) was SD.

EDIT- 150's with 5 liters were the ONLY ones
that went MAF. I got all excited about getting
a 5.8l MAF computer out of a July 1995 5.8 150.
Nope. It was SD.

t

 

Really wishing a manufacturer (at reasonable cost) would come along with vacuum harnesses, wires and ECMs all brand new. Broncograveyard and CPaddicts help a little but the cost can be a bit much for some items. I am also cheap and on a budget.

 

I agree but from what I've read here on FTE Ford changed the pin outs on a regular basis for the ECM. I don't know why but it would make creating aftermarket harness's to fit a total nightmare.

 

Conanski, are you saying that even if I get the harness from the 92 manual transmission and 5.8 engine I will need to change some of the pinouts? If so, do you happen to know what the changes would be?

 

You will have to buzz out the wires and create a little chart for the 2 harnesses, and then change anything on the new harness that doesn't match.

 

I didn't do so hot in programing but an aftermarket ECM programmed to act like a EEC-IV could be wire to all pins and then just programed to detect certain pins based on the original computer information entered. Internally I would hope a smaller board could be used with more weather proofing. I think me not buying such an item would be a cost issue although some tune-ability might make it worthwhile for others.

 

Why not use another 460 harness?

 

What does "buzz out the wires" mean? I have very limited knowledge of wiring so am not familiar with the terms.

My local junk yards don't have any 92 or 93 manual transmission 460's. I believe those are the only two years that will work without very extensive work.

 

"Buzzing" a wire involves using a multimeter or continuity finder, 1 lead is connected to a pin on one end of the harness and when you touch the right pin on the opposite end the multimeter or continuity finder buzzes.
Does your truck have the 4 round connectors for the engine wiring harness on the drivers side inner fender or does it have a larger rectangular connector?
The pins in these connectors are all numbered so it's pretty easy to create a list of what everything does with a little patience, and wires can be moved without cutting and splicing too..how just depends on the connector type.

 

Ok, I understand. I have used that to check continuity on wires in the past.

My truck has the large rectangular connector for the engine wiring harness and so does the 93 F150 I'm going to look at tomorrow. JY was closed today as it is Easter Monday. How does one move wires without cutting and splicing?

 

Have a look at this video, each connector is a little different but the general idea is the same.. Repining Ford connectors

https://video.search.yahoo.com/searc...40&action=view