Highway

I have a 66' coupe and the wipers will not turn off, it has the 1-speed switch. Thinking it was the switch, I replaced it with a variable speed but I'm still having the same issue (just not as fast). Thought maybe it could be the relay but I don't not see a relay in the schemetics. Does anyone have an idea of what this could be?

Thanks,
Highway

jlg2002

You can't aribitrarily change from 1 speed to 2 speed switch. cause there's extra circuits in a multi spped motor (I haven't seen a variable switch for a 66) all the power goes to the wiper motor from the switch

jlg2002

deleted

pungopete468

so.. you disconnect the switch and they stop working, correct? That would rule out a stuck relay...

It sounds like a short in your wiring. You need to find out if it is a short to power, or a short to ground. Test each side of the circuit and see.

350kmileFord

Does it look like they almost want to turn off, at idle? My wipers don't quite want to turn off either. It seems like it is in the linkage, but it's all firm.

When I turn mine off, they go to the bottom of the windshield; the passenger side stops perfectly but the driver's side goes to the bottom and actually cycles back up a little. Because it cycles back up, it causes them to do another complete rotation, and the cycle repeats over and over, etc, etc. When the d. side cycle back up a hair, it hits a spot of resistance, but then passes it and that's when it cycles all the way through. The only way I can stop this is if I am idling in drive (low current).

Is this happening to you, by any chance . . ?

Highway

It's a (1 speed) variable switch, I know that's an oxymororn but the variable was for the replacement of a one speed wiper switch (from CJ's Mustang). I have looked at the schematics in my service manual, I do have the 3 prong wiper motor which is a one speed motor, the switch also comes up correct. The new variable switch I take it uses a delay mechanism similar to a blinker switch. The switch has a chip board in the back of it. Problem is both switches are are not cutting the power off. I test lighted the wiper motor plug and there is current in one of the prong when the switch is disconnected. When I connect the switch then there is power in 2 of the prongs, one being delayed due to the variable speed switch. I've done a lot of electrical but this has me scratching my head. I'm afraid I'm going to need to pull the dash out and go through the wiring harness.