Wiper switch wiring
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Fleet Mechanic
Joined: Sep 2014
Posts: 1,627
Likes: 79
From: NE Texas
Wiper switch wiring
I assume the wiper switch wires are wired so that you have power in, then when you push 'washer' power goes to another post, low speed to another post, high speed to yet another (or maybe high just adds a second post to low?) - yesterday my wipers quit on low or interval and would only work on high. After trying the old switch and pluggig/replugging repeatedly everything worked and still does this morning - go figure. But the question is - while the wiring diagram shows which wires should go to/from the switch, it a) does not show the added harness and box for interval wipers and b) doesn't indicate which wire powers which wiper speed. Has anyone ever traced that?
Elder User
Joined: Jul 2015
Posts: 687
Likes: 4
From: CT
I has a similar issue. This guy Ben sent me an email which helped in troubleshooting. It read
"Provide power to the Redwire. Ground out the motor. Put a jumper wire from the power to the post right next to it which appears to be white for the low setting. Put a sumper from the power to the furthest right wire which is green which is the high setting.
It ended up being my switch which was the issue. I made my own switch.
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Fleet Mechanic
Joined: Sep 2014
Posts: 1,627
Likes: 79
From: NE Texas
I had bought a new switch from LMC (which of course I blamed first) - but when I put the original switch in it did the exact same thing. The new switch has one more post than the original (6 posts on the old one, 7 on the new one) but now with the added post I have power to the washer. It's complicated by having interval wipers, which add a harness and a black box in the middle of the circuit.
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