When you installed the Haltech did you remove the factory harness from under the hood? If you did the wire you need to ground is in the plug that stayed in the car. I beleve the pin number is 1L a blue/white wire. If you ground this wire the a/c relay will work again. However I don't think the a/c clutch will cycle. If anybody else has a fix for this please reply.
p.s this applys to a 86-88 TII
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1986 TII
hybrid turbo
j-spec series V motor Haltech E6K
720cc secondary injectors
Aftermarket exaust
1983 Mustang coupe
Cartech outlaw turbo kit
Haltech F3
paxton fuel system
1983 ford f-150
460ci big block

[This message has been edited by Twin Rotor (edited May 27, 2001).]