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Old 07-23-2011, 05:04 PM
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Convert Column Wiper Switch to Dash

I'm trying to take the cheap way out and convert my column wiper switch to the dash type using a universal type switch. The vehicle is an 86 GMC half ton pick up. The column switch has 7 wires and the new switch has 7 prongs on it, so I figured it would be an easy swap, but I have no idea where the wires need to go. The new switch has each prong labled B W 1 2 3 4 5. i will add pictures of the original wiring and drawings with each wire color labled. I used a power probe and found that the gray and purple wires run the wipers (probably hi and low, but not sure which) and the pink wire powers the washer. Please keep responses simple, because I really have little clue what I'm doing here Thanks.
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Old 07-23-2011, 05:39 PM
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Why do you want to convert it from a column switch to a dash switch?
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Old 07-23-2011, 06:08 PM
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Column switch is not working and sells for around $130. Lot cheaper to get the $15 universal switch. Truck is not original and will be used mostly for dump runs and plowing, but I need working wipers to pass inspection.
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Old 07-24-2011, 04:48 PM
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Any ideas?
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Old 07-24-2011, 05:08 PM
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Look here for some more info
http://coloradok5.com/forums/showthread.php?t=174785
It explains the color / function of the wiring
All you need to do now is match it to the switch you have
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Old 07-24-2011, 06:49 PM
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I checked that out and I get what the wires on the firewall side of the wiper module do, but I still need to know which wires from the column to put on which prong of the switch. I want to cut the column harness and add connectors to be able to just plug them onto the new switch.
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Old 07-24-2011, 06:57 PM
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Go to the junkyard and get a used column switch....a lot less hassle and less butchering in the long run.
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Old 07-25-2011, 02:14 PM
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See attached schematic showing the GM wiper motor and switch.
The white wire is hot 12 volts+.
The black wire is ground.
The purple and gray wires control the speed. Purple and gray grounded for low speed.
The purple wire grounded and the gray wire not grounded for high speed.
The gray wire grounded for park.
The pink wire grounded for wash.
Test the motor by connecting the wires as above. Maybe the problem is in the motor.

vicrod
Attached Files
File Type: pdf GM wiper-washer diagram.pdf (333.0 KB, 169 views)
File Type: pdf 001 GM wiper motor switch NKK.pdf (10.6 KB, 154 views)
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Old 07-25-2011, 07:03 PM
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The motor is good. It runs until the fuse is pulled out. I understand the wiring to the motor now, but still need to figure out the switch. How do I go about bench testing it to see what each prongs function is on the switch? Again, I'm new to this so please explain it like I'm a 5 year old kid. Thanks!
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Old 07-25-2011, 08:14 PM
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$ 3 test lite

GEt a test lite with a battery then plot out each terminal , clip the ground to one terminal and see where the light comes on as you turn the switch to the various locations, a lot more work than a bone yard switch
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Old 07-26-2011, 01:37 PM
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Also early GM used a dash mounted switch before going to the stalk (I think they changed in the late 70s). The wiring is the same for both.

If the motor runs without grounding the purple wire try grounding the gray wire with the purple wire not grounded. The motor should run until it actuates the park switch which opens stopping the motor.
When the purple wire is grounded the park switch is held closed keeping the motor running.

vicrod
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Old 08-02-2011, 06:12 PM
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Ok So I finally got around to bench testing and plotting each terminal. I hook everything up and everything seems to be working except I cant turn off the wipers. This was the same problem with the column switch! Now I'm thinking the column switch is probably ok and the problem is somewhere else. Any ideas?
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Old 08-02-2011, 06:25 PM
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Quote:
Originally Posted by shad88
Ok So I finally got around to bench testing and plotting each terminal. I hook everything up and everything seems to be working except I cant turn off the wipers. This was the same problem with the column switch! Now I'm thinking the column switch is probably ok and the problem is somewhere else. Any ideas?
Yeah. This is a common failure mode with GM wiper motors. The park contact in the motor is bad. Replace the motor. This is why troubleshooting BEFORE spending money is a good thing...
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Old 08-02-2011, 07:17 PM
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NAPA (Trico) Part Number 11-516

It's a washer pump, but it includes the printed circuit board for pulse wipers.

Also a common replacement item on that vehicle ... and may be less than a new motor.

HTH,
Don
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Old 08-04-2011, 03:44 PM
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Any other suggestions? I replaced the wiper motor today and no change. Still won't shut off. Hopefully I can return the wiper motor. I'm at the point where I'm considering using a toggle switch. If I I just splice an on/off toggle switch in to the white power wire will this work? Thanks for any help.
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