1965 Ford Fairlane Wiper Wiring Diagram
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Discussion Starter · #1 ·
I have a single speed wiper with a washer pump which appears to be an original installation on my 1966 convertible. (Recently a shop had my instrument panel out and re-connected the wiring but the washer pump doesn't work now and blows the fuse.) However, when I pull the wiper switch stem to activate the pump, the circuit fuse blows which indicates some kind of short. My installation is with one black wire coming from the wiper switch to the washer pump. I checked the black wire for a short and did not find one. Thinking the problem was with the switch, I have replaced the switch but cannot determine how the wiring is connected to the switch. The single speed wiper motor has 3 wires going to the wiper motor and a white wire that goes to ground behind the instrument panel. These are all connected to wiper switch with a plastic connector and can only fit on the switch one way. The other 2 prongs on the switch are for a white wire and the pump's black wire. My problem is that I don't know which prong is for which wire. Also, I have a new washer pump. The connector prong on the pump is for the black wire from the switch. However, when I check for continuity from the pump connector prong to the metal tab on the switch that is connected to the engine compartment side panel with a screw, there is no resistance. This means the current from the switch through the black wire will go directly to ground when the switch is activated.
My questions are: which terminal on the switch is for the black wire and which is for the white wire? and, if the black wire is to have 12 v going from the switch to the pump, what activates the pump if the connector on the pump goes directly to ground?
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The attached photos are from my '66, one before and one going together.
The connector should only go on one way, but you have to mess with it to find the correct position. The connector on the motor only goes on one way. The cloth covered black wire to the pump should go on the hot or + terminal and the other to ground.
On the single speed system there is a simple contact within the switch that puts power to the black wire with braid covering. It just goes directly to the pump. Has its own hole and grommet in the firewall.
They may have switched the single black and white wires at the switch. Or some other wire for that matter. Pull the black wire and see if you have continuity to the pump. Then check if you have continuity to ground, indicating a short. It is a simple circuit, but I did find my diagram does not really show the direct path of the hot black wire.
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Discussion Starter · #4 ·
Driveway:
Thank you for the pictures as they show the position of the black (w/ braided covering) and white wires on the switch. That was the information I was looking for. Neither the old nor the new switch shows the + or ground terminal on the switch. However, I still don't understand why the hot terminal at the pump (this is my new pump) goes directly to ground at the copper grounding tab on the pump when it is not installed. If I install the black braided wire to the pump and check for a ground, it will show up as a grounded circuit. I'll check this again later today and will let you know the results. Does anyone know how the pump works considering the lead, or hot wire, is grounded at the pump? This has me a little leary about putting real voltage to the new pump without understanding how the thing works.
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Discussion Starter · #6 ·
I tried all the recommendations prior to asking my original questions. The wiring is ok. However, I have a new pump (my old system has a ground for some reason) that has not been installed. When I check the electrical continuity from the connector tab, where the hot (black) wire connects to the pump, to the brass tab, or ground connection, on the new pump, it shows a direct connection. This will cause a short when the wire is connected and the washer pump switch is pulled.
Again, how does the pump work when the hot wire connection goes directly to ground via the brass tab when the switch is activated? There has to be some description somewhere as to how the pump is supposed to work.
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Hello. 
There were two different washer pumps used. One, which sounds like the one that you have, has one wire coming to it that brings power, and there is no ground wire for the pump. It grounds straight to the chassis, completing the circuit. The other pump has two wires with bullet connectors. One of them brings power from the switch and the other is a ground wire that grounds itself at the wiper motor. What it sounds like is that you have a two-speed wiper switch and a 65 single speed wiper pump and wiper harness. If that was the case, the car would do exactly what you describe, because even though the single-speed harness would plug into the two-speed switch, the wires don't come out of the switch in the same places. It sounds like you need a single speed wiper switch.
Source: https://www.allfordmustangs.com/threads/66-single-speed-wiper-w-washer-pump-wiring-problems.686265/
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