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  • 1965 - 1973 Classic Mustangs -General/Talk-

Any info on Dunne Rite harness. 5.0 efi conversion 68 mustang.

  • Thread starter Thread starter Dan94GT
  • Start date Start date Aug 27, 2020
D

Dan94GT

Founding Member
Aug 20, 2000
1,172
0
36
Titusville, FL
Aug 27, 2020
#1
  • Aug 27, 2020
  • #1
Hello. My Dads 68 we acquired a few months back has an EFI swap done with a "Dunne-Rite" performance Harness and Relay Panel. I cant seem to find any Diagrams online anywhere as it appears the company is no longer around.

Problem im having, is that the AC (aftermarket, though factory ac car) Does not seem to be connected to the EEC / correctly at least.
The computer runs an electric fan, but only when it gets to temperature, and not when its cool and the AC is running. Also because the computer dosnt know the AC is on it will idle rough and stall from the extra load. Will not stall if flipping off AC coming to a light. I know that the AC should have some kind Of WOT cut as well but dont know how that is to be accomplished either.

If anyone knows where I may find Info on this harness. or could shed some light on what needs added/ hooked up from the AC to the EEC Id much appreciate it.
 

65ShelbyClone

Founding Member
Sep 9, 2000
4,675
38
119
Antelope Valley, SoCal
Aug 28, 2020
#2
  • Aug 28, 2020
  • #2
Which EEC-IV is in the car? The common A9L/A9P from '86-93 Mustangs never controlled an electric fan because those cars had thermostatic fan clutches. WOT cut is probably determined through the TPS signal. I don't remember; I sold my '89 GT a very long time ago. The A/C idle up would have to be triggered by a sense wire that tells the ECU the compressor clutch is energized.

I would suggest tracking down a wiring diagram for the ECU you have and verifying that it's wired to the engine bay properly. The '86-95 5.0 forum will definitely have a diagram for those years of Mustang.
 
D

Dan94GT

Founding Member
Aug 20, 2000
1,172
0
36
Titusville, FL
Sep 14, 2020
#3
  • Sep 14, 2020
  • #3
It "Should" be an A9L or the like. Someone pulled the sticker off so I dont know for sure. It has A Tweecer on it and I havent gotten into the tuning on it yet.

The Fox EEC does have the hardware to run a single speed fan. Sometime the pin has to be added to the connector. And things have to be changed in the program. But, it can be done and is already working in this car. Just dosnt do what it needs to in regard to the AC being on or off.
 
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