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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Engine harness bolt together plug swap

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Old May 20, 2020 | 12:38 PM
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Engine harness bolt together plug swap

I'm doing an engine swap 300-6 to 351w the 351 has a obd2 harness and the truck is obd1 i have a obd1 harness for the 351 but the bolt together connector on the truck is square and the one for the harness is round.
I'm trying to find a diagram that shows the colours and locations the pins need to be in so I can swap the round plug for the square one. Does anyone have one or know where to find it?
Or would it work to simply colour match the wires on the two sides? As I have yet to see a diagram that shows the bolt through connector.
 
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Old May 20, 2020 | 09:11 PM
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If you have the ability, I would recommend swapping all OD2 harnesses in. No pinouts required, if you have the full set. Same for the ODB1.
 
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Old May 20, 2020 | 10:08 PM
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Converting to carb down the road OBD2 ran like crap
just need to be able to connect it so it will run
 
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Old May 21, 2020 | 09:16 AM
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Originally Posted by Dan Drover
... the 351 has a obd2 harness and the truck is obd1.
The only bolt together option you have is a complete underhood harness from a V-8 donor of your truck's year.

No reason at all to go OBDII

We could use the years of the players here.
 
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Old May 21, 2020 | 06:12 PM
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https://www.ford-trucks.com/forums/1...questions.html
 
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Old May 21, 2020 | 08:28 PM
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Donor truck is 96
new truck is 93
Picked up a 90 harness with the wrong end and want to swap that to the 93 plug
 
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Old May 21, 2020 | 09:40 PM
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You had/have a complete 96 OBDII truck, or just the engine?

If so what exactly is it, 150, 250?

And your current truck is a 93-6 with what trans?
 
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Old May 21, 2020 | 09:49 PM
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Have complete 96 f150 truck with obd2 not drivable
new truck is 93 f150 obd1 both have M50D
 
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Old May 21, 2020 | 11:48 PM
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Your absolute best bet would be source a 93- 5.0/5.8 truck & get the entire harness under hood.

It's possible that a 92 or 94 harness would work, but I wouldn't do it myself with out wiring diagrams for both.

That will plug into your main cab & light harness & will give you greatest likely-hood getting it up & running soonest.

Don't use any of the wiring harness on the 96 engine.
 
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