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View Full Version : Wiper motor limit switch replacement


LenB
January 23rd, 2008, 07:47 PM
My '97 wipers stopped working in the intermittent mode, wash mode and would not go back to their park position when turned off. The first advice i got was that the wiper relay crapped out. I ordered one - got it and found out that '97s do not even have a relay for the wiper motor. Mike at ECR shed the light... the plastic fitting that the wiring harness attaches to on the motor itself is also a limit switch. (which controls the intermittent and park position when you turn the wipers off). The part costs between $25 and $35 - depending on who you want throw your money at. After I had already ordered mine from RN for $35 I found that TNLR will sell you one for $25. The sad part of the ordering from RN is that it took 1.5 MONTHS to ship it to me....very lame. I was about to cancel my order and buy the one from Bill at TNLR when I found that RN had just boxed mine up and shipped it.

Anyway I took pics of the instal. It was an easy task - but a picture is worth many words and thought someone else may benefit from the tutorial.

Pic #1. remove the two left screws that hold the dash instrument cluster - remove the three screws that hold the side of the dash/heater control arms - if you have AC you have to remove two big sheet meatal screws that hold the AC ducting to the bottom corner of the dash - carefully pry out your left most AC vent . This gives you access to a major sheet metal screw to remove - the second one is underneath the ducting. Then remove the bottom corner of the dash (3 screws).

Pic #2 I circled the limit switch with all wiring attached.

Pic #3 This is a view of the switch that faces the wiper housing. - there is a plunger switch, Retaining clip and a register pin to keep the switch in the correct location.

Pic #4 Before removing the wiring harness use a marker on your replacemnet limit switch to identify which color wire attaches to which lead . Remove the Limit Switch by carefully prying up the left end of the switch and pulling the switch off to the left.

Pic #5 View the hole for the switch and retaining clip. The oval hole is where the plunger switch goes - the square hole is where the retaining clip goes.

Pic #6 This pic shows where the elements of switch go - register pin, clip and plunger switch.

Pic #7 instal complete - you can see where I marked the switch housing terminals so I knew where each of the 3 bottom wires go. The top harness fits only one way - no need to mark it.

District 90
August 15th, 2010, 03:49 PM
I'm in the process of replacing the wash/wiper switch, as well as, the indicator switch on a '94 D-90. I removed the upper/lower steering column housing and the steering wheel.

What is the best technique for removing and reconnecting the rubber wiring pin housing? :sunny

chris snell
August 16th, 2010, 12:46 AM
Great write-up, Len.

Does anybody know if that limit switch and wiper motor is located in the same location in the 94 as the 97?

Also, I've been having a problem with the wipers refusing to stop running when the truck gets wet. It started doing this after the mud of SCARR. I'm guessing that I have a bad ground someplace. Does anyone know where that might be?

evilfij
August 16th, 2010, 05:05 PM
Probably behind the wiper motor cover.