There is no pink wire plugging into my wiper motor, light blue, black and yellow/white, and they are all on the driver's side of the motor.
There is a pink wire that comes out of the wiring harness at the same point these three wires come out, of a slightly heavier gauge, that goes up under the distributor shielding and then on to points unknown.
Also, I'm looking at the 1977 Electrical Troubleshooting Guide and don't see a pink wire in the Windshield Wiper/Washer circuit. In reviewing the schematics, it appears that there are pink wires from the ignition switch that goes to the fuse box if I read the schematics right. There are also pink wires that come from these two sources and to the:
Radio Noise capacitator (I think that is what the pink wire I am refering to is for as it goes toward the distributor and aren't these things part of the ignition circuit????)
Turn, flasher and backup lights
Seat belt, headlight and ignition key warning
Parking brake light
Generator warning light
The car is hot right now so I really can't play around under there but if this is the wire you are looking at, I'll see if I can trace it further tomorrow.
Hope this helps. I'm far from knowledgable about electrical circuits but I think I can handle the color thing, no promises though:confused
Thanx for checking. I looked hard yesterday. I noticed a couple nearby wires that go to different places.....like the distributor and such.
On the driver's side of the motor, I have a 3-wire -plug and a 1-wire plug. I re-checked my shop manual (unfortunately it is a 1966-1976 manual, but it is usually pretty close). This appears to be the necessary wires needed to operate it. Chris mentioned that he thinks the pink wire hooks up in conjunction with the washer pump circuit. One of the wires on the 3-wire connector (the yellow one) is tied into that circuit, so I'm still curious.
It may be possible that this motor came from a different year vehicle. I wonder if the older model vettes (the ones with a wiper door that could open) had a limit switch that sent a signal back to the motor to let the motor know that the door was open.
If anything, I'll stick my tester in the pink-wire connector, and see if (and at what time) it becomes hot. If it does not become hot, I can always give it a quick 12V jolt and see what happens.
My 80 sounds just like your 77. One 3 wire connector and a single wire connector (ground). No other wires on the wiper motor. You may be on the right track with the extra wire and wiper door circuit, but I have no wiring diagrams for earlier models.
Yeah it was controlled by vacuum, but I kinda think that there was a limit switch, which either opened or closed when the wiper door was closed. This would allow a 12volt signal to enter the wiper motor and let it know not to operate, cuz the wiper door failed to open.
I am just speculating, but I did read somewhere about a wiper door limit swith. Since my car was made into a convertible, it may be possible that they took the wiper motor from the donor car too.
I was playing with the wipers last night (trying to get them to work) and I found the fifth wire you mentioned. According to my (80) shop manual it is for power to the wiper motor when you hit the washer switch. There is a harness coming out of the firewall about 6 inches to the right (toward the passenger side from the wiper motor) that it comes out of.