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Windshield wiper return question
- Thread starter overton
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- Thread starter
- #22
wiper stop and park
looking at the schematics the 77/79 and other late models all seem to work the same functionally
with the switch in off, the ground off that cam at s allows it to keep running until the physical position moves and removes the ground
in other words until the sweep is complete and you are in park
without the ground the wipers will quit the moment the switch is off and not continue the cycle until the switch hits park (colored red)
try grounding your windshield with a jumper to a good ground on the body
the wire colors should guide you which does which if needed and the problem lies on the other side of the switch to the motor
hmm all new shiny paint did someone say? no metal to metal maybe to provide the ground?
looking at the schematics the 77/79 and other late models all seem to work the same functionally
with the switch in off, the ground off that cam at s allows it to keep running until the physical position moves and removes the ground
in other words until the sweep is complete and you are in park
without the ground the wipers will quit the moment the switch is off and not continue the cycle until the switch hits park (colored red)
try grounding your windshield with a jumper to a good ground on the body
the wire colors should guide you which does which if needed and the problem lies on the other side of the switch to the motor
hmm all new shiny paint did someone say? no metal to metal maybe to provide the ground?
- Thread starter
- #25
I'm pretty sure I'm getting a good ground. In the first photo I've disconnected what I believe is the ground wire and the windshield wipers stop when the switch is pushed in.
In the second picture, I pushed the ground wire against the housing the windshield wipers jump to the middle of the windshield. I'm perplexed.
In the second picture, I pushed the ground wire against the housing the windshield wipers jump to the middle of the windshield. I'm perplexed.
Had the same problem last night when I cleaned and lubed mine. Take the nut off the shaft that attaches to your linkage with a 10mm wrench. Pull the shaft off the linkage. Rotate your linkage back into position. Mine was extended all the way out towards the passenger side, reattach the shaft to the linkage with the 10mm nut. You should be good to go.
overton, is that pic you show with the cover off when the wipers are parked?
Assuming so, that orientation of the disk (the gear with traces, not the cover) is how it will always be when parked. What you need to do is remove the disk, physically pull the wipers down to the parked position, then put it back. The worm gear will turn when the disk is off and you pull the wipers down. You may need to turn the worm gear with a wrench instead of pulling the wipers down, not sure. Then you may need to fine tune it by a tooth one way or the other.
The black wire is not the ground for the whole setup, it only provides the ground for the park circuit when the switch is turned off. It's the ground shown between the red dot and the 'w' in "wiper" in bsmith's diagram. The switch still provides ground to the motor when it's in the off position. The path for that ground is from the black wire, through the park circuit, out to the switch via the LW wire and finally to the motor via the LB wire. Convoluted, eh?
The only ground that comes through the mounting bolts is for the parking circuit, so if new paint or other insulation was preventing that, the wipers would still work, they just wouldn't park.
You can see that the black ground wire for the parking circuit touches the trace on the disk that is missing part of the trace. If you didn't do it already, you should put some conductive grease on the traces and the contacts after cleaning off the old crap. It is possible that what's still in there is in ok shape, in which case you could just smear it around a little and coat the contacts.
Once you get it all working like you want, you might seal that cover on with a little FIPG.
Assuming so, that orientation of the disk (the gear with traces, not the cover) is how it will always be when parked. What you need to do is remove the disk, physically pull the wipers down to the parked position, then put it back. The worm gear will turn when the disk is off and you pull the wipers down. You may need to turn the worm gear with a wrench instead of pulling the wipers down, not sure. Then you may need to fine tune it by a tooth one way or the other.
The black wire is not the ground for the whole setup, it only provides the ground for the park circuit when the switch is turned off. It's the ground shown between the red dot and the 'w' in "wiper" in bsmith's diagram. The switch still provides ground to the motor when it's in the off position. The path for that ground is from the black wire, through the park circuit, out to the switch via the LW wire and finally to the motor via the LB wire. Convoluted, eh?
The only ground that comes through the mounting bolts is for the parking circuit, so if new paint or other insulation was preventing that, the wipers would still work, they just wouldn't park.
You can see that the black ground wire for the parking circuit touches the trace on the disk that is missing part of the trace. If you didn't do it already, you should put some conductive grease on the traces and the contacts after cleaning off the old crap. It is possible that what's still in there is in ok shape, in which case you could just smear it around a little and coat the contacts.
Once you get it all working like you want, you might seal that cover on with a little FIPG.
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- Thread starter
- #29
Alright it was the nut on the back of the linkage took the nut off, brought the wipers down, lined up the mounting holes, reattach the arm put it back together wipers park where they're supposed to - You could probably accomplish the same solution by rotating the disk with the contacts but this was easier and purely mechanical - Thank You!
Glad you got this figured out 
Mine have parked vertically about 80% of the time since I reassembled after paint. Sometimes they park correctly, then the motor will turn itself back on and they'll move up to vertical position and then stay off. I think my solution will be the same as yours (hope).
Mine have parked vertically about 80% of the time since I reassembled after paint. Sometimes they park correctly, then the motor will turn itself back on and they'll move up to vertical position and then stay off. I think my solution will be the same as yours (hope).
- Thread starter
- #32
Sweet!
I will be the 3rd (in this thread) having this issue after a re-paint/reassemble on my 79'. Just took first drive in rain and they park at 12 o'clock. First time turning on they took a dive into the hood! Yikes! real head scratcher, praying I didnt install upside down, but cant think how that could occur. Thanks Mud! Doesnt rain beed up nicely on fresh paint? 
- Thread starter
- #37
Been a long time since I dealt with this but the ultimate and easy fix was to remove the nut on the back of the linkage, manually put the wipers down in the desire "parked" location, lined up the mounting holes, reattach the arm put it back together.
I was 180 out lol, reminds of 2 months ago. This is an easy fix, took 15 mins. The small bracket (off the motor) that connects the armature needs to point straight at the passenger door, 9 o'clock when facing the truck head on and unit in proper orientation; on a 79'.