1985 v6 to v8 carb swap
- Thread starter mgriffin_2222
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I read elsewhere that it interfaced with the "TSAD" module which was for some funky two speed front drive, but the AC interfaced through this module so if its removed the AC needs to be rewired. Havent dug into the wiring harness diagram to see if its simple or complex. 
From Facebook post by Randy Nicholson
For a 1985 factory carbureted car, that computer is the TSAD module which does essentially nothing. The AC runs through it, so if you bypass the module, you would have to wire the AC wiring around it. It was for the Two Speed Accessory Drive which was never actually a working system. EFI car is a different story.
From Facebook post by Randy Nicholson
For a 1985 factory carbureted car, that computer is the TSAD module which does essentially nothing. The AC runs through it, so if you bypass the module, you would have to wire the AC wiring around it. It was for the Two Speed Accessory Drive which was never actually a working system. EFI car is a different story.
So what is the TSAD module, I search and got efi computers, google is trash, did find a post here but not sure there was a resolution and they were going to run a Holley setup I think, anyway here is that mess...
Electrical Thread '1985 Gt Wiring Questions'
Check out this post on Facebook, Randy Nicholson gives some detail about the TSAD module and its purpose.So what is the TSAD module, I search and got efi computers, google is trash, did find a post here but not sure there was a resolution and they were going to run a Holley setup I think, anyway here is that mess...
Electrical Thread '1985 Gt Wiring Questions'
T-Top Mustangs | Got this 85 GT and need to get a harness and ECU for it | Facebook
Got this 85 GT and need to get a harness and ECU for it. Last owner put a 88 or 89 harness in it but done it the worst way imaginable. There anyone who even makes a 85 harness or computer or will I...
www.facebook.com
Interesting read.... He said something about rewiring around it in his reply.
So I suppose it would make more sense to someone who had a diagram....
So I suppose it would make more sense to someone who had a diagram....
Dug out my Haynes manual, here are a couple pics that I know include the AC system. I didn't spend a lot of time nor did I scour the pages, so there may be more than this.
The Haynes manual could be beneficial for you, but I think the Prospero diagrams are a lot easier to read. They're larger and color coded. I've not traced any of them to know if there is something wrong with them, but I think they would be a great addition to anyone's tool arsenal.
colorwiringdiagrams.com
Or, you can find them on Ebay (which is where a lot of us have found them to begin with).
The Haynes manual could be beneficial for you, but I think the Prospero diagrams are a lot easier to read. They're larger and color coded. I've not traced any of them to know if there is something wrong with them, but I think they would be a great addition to anyone's tool arsenal.
Ford 1985 Mustang (Fox Body) US Spec 4 pages
Prospero's Wiring Diagrams presents: 11 x 17, Laminated, Full Color Wiring Diagrams for Motorcycles & Vintage Sports Cars! PROSPERO'S WIRING DIAGRAMS offers the Sports Car Enthusiast the finest color wiring diagrams available. Our diagrams are accurate and easy to use - they are based on Factory...
colorwiringdiagrams.com
Or, you can find them on Ebay (which is where a lot of us have found them to begin with).
11 x 17 COLOR Wiring Diagram for Ford 1985 Mustang (Fox Body) US Spec 4 pgs | eBay
Make & Model: Ford Mustang (Fox Body Style). YOU WILL GET A DIAGRAM - NO MATTER WHAT. Prospero's Wiring Diagrams presents 11 x 17 - Bigger than other wiring diagrams. The Quick and Dirty on Our Wiring Diagrams.
www.ebay.com
I have the Ford electrical diagrams.. though those Haynes ones look fairly simple, if they're complete and accurate. I'll study the factory diagram and see if I need to get the Haynes or Prospero's, thanks very much for the info! I have located the Unicorn 1985 5.0 carburetor wiring harness in a wrecking yard, waiting for them to pull it from the vehicle, so may not have to modify it at all (fingers crossed!).
Figured it out. The v6/efi harness has an A/C pressure switch on the dryer, which interfaces with a full throttle cutout relay and the ECU. Fairly simple to remove most of that and have the switch pass power to the A/C clutch (didnt retain the full throttle cutout relay since we didnt install a switch to detect full throttle).
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