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Old 11-14-2017, 12:14 PM   #1
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Join Date: Oct 2017
Location: Northeast Georgia
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Windshield Wiper Motor Wiring Info Needed

Hi all, I've run searches but don't find what I need in the forum. My windshield wipers on the 1999 Executive are non-working. I found I had one wire "hot" (12V) in the plug going to wiper motor, concluded motor had to be bad, ordered new motor for $160, (looks just like old except its connector plug is pigtailed to motor where the old one had its connector mounted directly to motor case), but doesn't motor. Foolish me, I did not have enough info. It must be necessary for more than one wire to be hot to make motor run. There are five wires going to the motor, five connectors on the old and the new motor. The connectors on both motors are same sequence: L, H, P, S, X. Old motor only had two of the connectors leading into motor, plus a ground to motor case; new one is probably higher functioning as all of its five wires seem to have destinations either as ground or into motor.

First question: does anyone know which of the incoming wires from the switch have to be hot for each function (Lo, Hi, Park, intermittent, Washer)?

My incoming colors in the connector to the motor are: White (ground, according to wiring diagram), Red, Orange (only wire Hot with 12V with switch on, assume on is slight rotate right of switch, no markings on switch), Black, and Green, going respectively to markings L, H. P, S, and X on the motor connection. They ALMOST match the info in the wiring diagram book that thankfully was among the ten pounds of paperwork that had been left in the cabinets; the wiring diagram says the wires are respectively: White, Black, Orange, Red, and Green. In both cases I have stated them in the same sequence as the connector plug from switch to motor.

The wiring diagram also shows a yellow wire leading off the fuse block in the outside compartment under driver seat going to the switch but that wire is cut and only an orange wire leads from the fuse block. Both were apparently originally connected, there are two connecting screws for that fuse. That is just one of the mysteries of this rig.

Second question: Both old and new motors have legends on their connector: L, H, P, S, X. L and H seem obvious as low and high, P as park, but what are S and X supposed to represent?

I know this is a very wordy post but I have tried to be as thorough as possible so there is no doubt how coach and motors are wired.
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Old 11-14-2017, 01:54 PM   #2
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Typically the hot wire going to wiper motor is for the "park function". The actual high and low speed wiper function will have a separate (different) power supply/feed when you turn on the wipers.

I don't know if this link will help or hurt you - as this is not the wiper wiring diagram for your Executive, but it is typical for the wiper function in these older coaches and automobiles.
http://www.garysgaragemahal.com/windshield-wipers.html
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