Doing a v6 efi to v8 carb conversion, would like to keep it clean and factory looking as possible. Anybody remove the TCAS computer and get the A/C to work without it?
TIA
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.
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...
A little background. I've had a 85GT for 8 or 9 years and it had a 3g alternator upgrade when I got it. I've converted it to Holley Commander 950. I am in the process of replacing the C950 with the HP ECU and want to redo all of my wiring I used to install it originally. I am also wanting to get rid of the TSAD and all the wiring associated with it and simplify the A/C wiring. I am thinking of doing a partial wire tuck. Hide some of the wiring, and add the underhood fuse/distribution box from a SN95. I'm trying to make heads and tails of the existing wiring. My biggest question is...
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...
A little background. I've had a 85GT for 8 or 9 years and it had a 3g alternator upgrade when I got it. I've converted it to Holley Commander 950. I am in the process of replacing the C950 with the HP ECU and want to redo all of my wiring I used to install it originally. I am also wanting to get rid of the TSAD and all the wiring associated with it and simplify the A/C wiring. I am thinking of doing a partial wire tuck. Hide some of the wiring, and add the underhood fuse/distribution box from a SN95. I'm trying to make heads and tails of the existing wiring. My biggest question is...
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...
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.
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).
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.
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).