1989 Mustang GT Wiring....
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Old August 25th, 2009, 04:35 PM   #1
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1989 Mustang GT Wiring....


I bought a 1989 Mustang GT and I took out the EFI 5.0 that was in it and am putting in my carbed .302... I need to know what wires I need from the EFI wiring harnest that in coming out of the fire wall of the car... i.e. ( For the AC, Starter, radio and so forth) Any information would be greatly appreciated!
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Old August 26th, 2009, 12:01 AM   #2
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I don't believe anything from the computer harness is needed. The A/C wires are in the computer harness though.

I put a Carbed 351W in my old 92' 4 cyl and I didn't need anything from the computer harness out to the engine.
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Old August 26th, 2009, 02:48 PM   #3
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Was there anything you needed for the starter and AC? I left the AC connected but I am unsure if there is any wires for the AC that go to the block or what not.... I also have the Distributer that is stock on the 1968 block and it does not have the harness for the ignition and such that plugs into the 5.0 distributor.... should I go ahead and splice into the wire harness and find the ignition wire and run that straight like I would in the 68 block?
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Old August 26th, 2009, 04:41 PM   #4
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The AC Wires will come out of the pass side firewall from the Computer. There will be two wires for the Pressure switch on the dryer and two that go to the compressor. I do not believe there are any more that go through that hole to the ac system.

As for the Starter there will only be a wire that goes from the Drivers side firewall to the Start Solenoid. The Dizzy wires will also go through the Drivers side firewall.

The only wires you will be concerned about removing are the ones that come out of the pass side fire wall from the ECU in the pass side interior foot well. It resides behind the plastic right forward of the door.

Now remember that the AC wires are integrated in with the ECU Harness. The reasoning behind this is for the WOT AC Cutout.


It's not too big of a deal to rewire it if you want though.

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Old August 26th, 2009, 05:28 PM   #5
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Sweet! I appreciate your help bro! I know that I am also going to have to bypass the Fuel pump cause its electric.... SO I will replace it with some tubing.... I have a manual pump on my block... were there any probs you ran into? that I should be aware of? My main concern is just getting it running and drivable... I have the .302 sitting in the mounts and have the tranny bolted up! Just have to do the starter and AC.... Thanks bro again
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Old August 26th, 2009, 07:27 PM   #6
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On my fuel tank I welded in a rear sump and bolted a 140 GPH electric fuel pump up behind the rear bumper. No real issues other than the prior owner set off a wire bomb in the car so I had to basically rewire everything.
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Old August 27th, 2009, 09:09 AM   #7
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HARNESS
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Old August 27th, 2009, 02:44 PM   #8
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what are you meaning by Harness? Is there one that you know of for this conversion?
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Old August 27th, 2009, 04:47 PM   #9
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Originally Posted by airbornemp21 View Post
what are you meaning by Harness? Is there one that you know of for this conversion?
No, I think he was trying to correct your spelling. Don't worry about it, we knew what you meant.
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Old August 27th, 2009, 05:06 PM   #10
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Originally Posted by neverfastenough1 View Post
No, I think he was trying to correct your spelling. Don't worry about it, we knew what you meant.
LOL... Little boys... dont know what to do with their time! I guess I forgot that the Cat in the Hat is a stickler on Spelling! lol! Thanks brother
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