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I have the later style two speed wiper switch with 7-wires and integrated washer function. I’m reviewing the wiring and have a spare brown wire coming from this wiper switch. There’s already a wire going to the accessory post of the ignition (orange/white). Any idea where this wire goes since it doesn’t appear in the wiring diagrams.
This is the Custom Cab only (sweep speedometer) plastic bezel ground wire that originally connected to a spade on the same screw that holds the ICVR to the backside metal housing and the ring terminal had a screw through it to the welded-in metal steering column support just behind the dash bezel. In these pictures it's the black wire that is stretched fairly tight under the dash. Look for the ICVR in the one picture and just above it find the spade and the wire connects there. The round speedometers that used the metal bezel didn't use the ground wire at all since they were grounded through the metal bezel, although only when screwed into place in the dash panel, if you want to test the metal bezel equipped dash without it screwed into place I use a jumper wire with alligator clips to ground the metal dash (a bit off topic but just rounded out the picture).
Here's the entry in the Master Parts Catalog. They made a slight error in not also listing the 1966 F100 4x4 81B Custom Cab since it also used the plastic bezel sweep speedometer. 81A is Standard Cab and 81B is Custom Cab.
So that’s what’s weird, I noticed that grounding wire in the diagrams and confirmed I have the wire that connects to the ICVR with the spade connector.
Lots of weird things have happened in the past 50+ years. If the wire running to your wiper switch has the spade on the other end it would seem as if someone added the wire from another truck. But, why, when, etc. I can't answer. I can tell you that number is called out in the MPC as being 1 per vehicle as required.
There is a wire with female spade terminal that goes to the wiper switch for the 7 terminal style that goes through the firewall to the washer pump on the left inner fender but it's quite a bit longer and doesn't use a ring terminal on either end. 5 terminals are used by the wiper motor connector. I'm trying to recall that the one other terminal is used for. Possibly a ground, looking now. The wiper motor is grounded through the bracket that connects it to the firewall through the copper strip on the back side. Likewise, the pump is grounded through a small strap that one of the mounting screws passes through on the left mount.
Some information I gave to Wayne back in 2020. I seem to be saying the connector uses 5 wires and the pump uses one but nothing mentioned for the 7th terminal. This is from my 2WD truck. Makes me think not all 7 were used so someone may have decided to add a ground wire just for the heck of it. I'll keep looking.
Thanks a bunch TA455HO! So here's what I'm working with. The wiper switch has the black/white wire going separately through the firewall to the washer pump, orange/white going to the accessory post of the ignition switch, four wires going as a bundle to the wiper motor, then this lone brown wire connected to the wiper switch with a spade connector and the other end has a round screw connector that isn't connected to anything.
OK, I think I have a better understanding now. Excluding the 5 wires for the wiper motor, the other two wires connect to what amounts to a 'Normally Open - Temporary Pull Switch' built into the wiper switch. So instead of the previous single push button above the ignition switch on some trucks they use those connectors on the wiper switch to pass the positive voltage through from, it looks like, the heater switch to the washer pump motor. I still am looking at that some. It shouldn't matter which order the two wires to this are connected as this sort of non-grounded switch circuit doesn't have a polarity.
I'm not sure about your brown wire. What I'd do is test the pull switch on your wiper switch and make sure it works like in the video and then provide a positive 12V to the wire that goes to the washer pump and make sure the pump works. Then you should be able to provide a 12V to the connector of those two that doesn't go to the washer pump.
To follow up on this thread, I finally got all the repairs completed on my wiring and hooked up a battery to test everything. The brown wire coming off the wiper switch is the power for the washer fluid pump which is activated by pulling out on the wiper switch. So my wiper switch now has two wires coming off the accessory post of the ignition switch, one to power the wiper blade motor and one to power the washer fluid pump.
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