The Unknown Wire

The Slider · Sep 1, 2017

My 86 Bronco II has a Mystery wire.. I found a Disconnected black wire with a rubber Diode attached to it. The wire has power , So i taped it up around the master cylinder. (See Fig 1)... It goes to (Fig 2) and is soldered to 3 wires ONE runs to the compressor and the others split again and goes into the wire and and one part goes to the AC pressure switch and the rest go into the relay area. I'm trying to post a picture of the wires... If this works can someone give me a clue to where it goes?

Thanks!
Chaz

The Slider · Sep 5, 2017

How about a wire schematic of the AC system?? I don't see that in my Chiltons.. And my Official 86 Bronco II/Ranger Ford manual I bought on eBay was missing ALL the schematics. SIGH!

adsm08 · Sep 5, 2017

You probably bought the shop manual. No Ford shop manual has the diagrams, so techinically they are not missing. For that you need the EVTM.

My 87 EVTM is missing, but if I can find it I will get AC diagrams up.

85_Ranger4x4 · Sep 6, 2017

Might check around the throttle area.

All that is unaccounted for that I can think of in your harness is the wire telling the WOT relay to cut in and kill the A/C. Not sure if that would have power though, maybe it is grounded at the TPS to activate the relay.

The Slider · Sep 7, 2017

The wire is disconnected around the area below the Master Cylinder.

85_Ranger4x4 · Sep 8, 2017

The Slider said:
The wire is disconnected around the area below the Master Cylinder.

In my '88 A/C harness that is the only wire unaccounted for. One goes to the TPS, one goes to the high pressure switch and one goes the A/C compressor. The TPS wire goes to the PS fender for the wide open throttle relay which kills the A/C under hard acceleration/WOT.

Being a 2.9 with the throttle at the front of the engine it would probably be able to flop over to the master cylinder area if it was left disconnected. I don't remember how mine was routed when I pulled it a year ago and I am not going to be using the WOT system as originally intended on my engine.

The Slider · Sep 13, 2017

85_Ranger4x4 said:
In my '88 A/C harness that is the only wire unaccounted for. One goes to the TPS, one goes to the high pressure switch and one goes the A/C compressor. The TPS wire goes to the PS fender for the wide open throttle relay which kills the A/C under hard acceleration/WOT.

Being a 2.9 with the throttle at the front of the engine it would probably be able to flop over to the master cylinder area if it was left disconnected. I don't remember how mine was routed when I pulled it a year ago and I am not going to be using the WOT system as originally intended on my engine.

Oh, you can tell by the way the wire is laying that it has been laying this way for many years... Does your wire have a Diode in that black wire? Also, My WOT works.. The compressor stops when I floor it..

The Slider · Jan 10, 2018

I managed to trace the "Unknown Wire" end down to the compressor then the low pressure switch then to the WOT Relay and a Ground... does anyone have a schematic of this?

The Slider · Jan 10, 2018

85_Ranger4x4 said:
In my '88 A/C harness that is the only wire unaccounted for. One goes to the TPS, one goes to the high pressure switch and one goes the A/C compressor. The TPS wire goes to the PS fender for the wide open throttle relay which kills the A/C under hard acceleration/WOT.

Being a 2.9 with the throttle at the front of the engine it would probably be able to flop over to the master cylinder area if it was left disconnected. I don't remember how mine was routed when I pulled it a year ago and I am not going to be using the WOT system as originally intended on my engine.

Could it be possible this is is NOT used?? I have no schematic.. A schematic would be nice if someone has one...

The Unknown Wire

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