i have a 1986 ford f150 with a 302 and its fuel injected. I need to know where the wires go that come off the compressor and go to the frion tank. Their are 2 wires that come out of the connectors of the compressor and go toward the tank. Then two feet after the wires come out of compressor one wire splices splices into 2 wires and 1 goes to the tank and the other is the one im trying to find where it goes. If any one know where this wire goes I would be most appreciative.

Thanks
Ill try to post pictures to make more sense

 

It goes to Pin #10 of the ECA (EEC, PCM). Most of the time it is a Black wire with a Yellow stripe.

This is the same wire that on a non-FI truck that goes to a solenoid on the side of the Carburetor for upping the Idle when you turn on the A/C. But on non-FI truck the wire took off before the Clutch Cycling Pressure Switch.

There may also be a Diode to ground along this same wire.

That item the wires go to on the “frion tank” (Accumulator Drier) is the Clutch Cycling Pressure Switch and closes above 43.5 LBS. and Opens Below 24.5 LBS.

 

The above should have read Pin #10 EEC not ECA sense you have FI, ECA was for the Trucks with non-FI.

Here is a Diagram.

 

This wire that breaks off got caught in the fan blade and no i dont know where it goes

 

Just to verify, what is the color of the wire that got caught in the fan? Is it black with a yellow strip?

 

Pretty sure its just black

 

If it's just black, then it must be the ground for the compressor clutch. You need to go over the whole thing to make sure though.

Start at the compressor clutch. Find the yellow/black strip wire. It should hook to one side of the plug. Trace this back, and unwind the harness tape off the wires. You should come to a lump in the wiring, with a little electronic component spliced into the wiring. This is the diode. After the diode, the black/yellow should continue on in the harness, and be ok.

Look at the other side of the diode. There should be the plain black wire on the other side spliced in. This plain black wire should be the one that goes to the other side of the compressor plug, opposite the black/yellow wire. This plain black wire also should either run on down into the harness, or it will run out and bolt to a screw on the engine somewhere. This is possibly where the mystery wire goes if it's black. Look around the bracketry on the engine, and see if you can find a bolt that might have a terminal peeking out where the wire was pulled out.

 

that sound right thanks you Ok i cleaned it off real good and its a black wire with a yellow patch stripe, like road lines. This is the one that got caught in the fan. My mistake sorry about that.

 

You will have to look in a nearby harness to find the other end of the yelllow striped wire, because that is the hot wire for the clutch on the compressor. Just make sure you find the diode and verify it's still there and can be hooked back up if it's not. If it got snatched away in the fan also, you need to replace it.

 

Breaking news I just bypassed the wires at the frion tank for a second and the compressor kicked on. So that now means i have low pressure in tank right and what does this mean on the cut wire

 

That probably means the cut wire was the one that went back to the engine computer. I believe this wire told the engine computer to raise the idle speed when the air compressor is activated. So you may notice the engine will not idle up like it used to.

About the low pressure switch, yes it's either low on freon or the pressure switch is bad.