Wipers work on high only
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Joined: Mar 2002
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From: Byers USA
Wipers work on high only
My 91 Ranger wipers only work on high speed and will not park when shut off. The low & intermittent speeds are completely in-op. Can anyone help me diag. this? Thanks
Post Fiend
Joined: Apr 2002
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From: Central Kali
Wipers work on high only
I don't know your truck but usually the lack of low speeds is a resistor assembly inside the ductwork that opens up. It drops the voltage to the motor. The lack of park function could be the switch or the motor. 
Senior User
Joined: Aug 1999
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From: Bel Air USA
Wipers work on high only
The lack of low speed in the motor that has been seen on this site is for heater/AC blowers not the wiper motors. Wiper motors DON'T have resistors for the lower speed. They use just part of the motor winding for the lower speed.
Posting Guru
Joined: Dec 2002
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From: Billings MT
Wipers work on high only
Is that a dealer item?
I am having the same problem, thought it was the switch and that didn't help. Was gonna buy a new motor, but if the speed governor thing is replaceable, I'll go that route.
Thanks
I am having the same problem, thought it was the switch and that didn't help. Was gonna buy a new motor, but if the speed governor thing is replaceable, I'll go that route.
Thanks
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New User
Joined: Jan 2008
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Wipers work on high only
Yes it's a dealer item.
There are aftermarket systems but they are cheap by comparison.
There are aftermarket systems but they are cheap by comparison.
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Wipers work on high only
Seen that problem about a year ago w/my 91. In the helm manual for my truck it says, if the wiper works on high only then the switch is bad. There's no need to check for pwr or a wire going to gnd. It's the switch that has a wiper that runs on a rheostat. The rheostat is taken out of the loop when the switch is placed on high.
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Thanks for all the posts on this. I pulled out the delay module and found diode D2 with bad solder joints to the circuit board on the heatsink bracket side. Diode D2 feed the relay that completes the low speed circuit and when the solder joints break, no low speed and no delay. I resoldered all three connections to D2 on the circuit board and added some small wires wrapped around the protruding leads to the relay leads in parallel for extra connections (just in case the PCB joints break again). D2 is located right next to the relay and has a U-shaped bent metal heat sink bracket with two bend tangs soldered to the PCB. After soldering and adding the parallel wires, reinstalled and it works like new. But before I read these posts, I had changed the wiper motor and still had no low speed so was scratching my head thinking it was the switch. Now I have a new motor and 'better than new' delay control module so should be good for many years.
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