Wiper - Low Speed not Working

[zauimaui]

The low speed on my TR6's wiper has not worked since I bought the car this summer, high speed does work. I've looked through some manuals but I cannot determine whether it could be a connection or something similar failing. Has anyone ran into a similar problem? What do I need to check?

 

[RobT]

This is something they don't tell you in the manuals! If your TR6 motor is the same as the one in my TR250, then there should be three wires comming from the motor. One goes to +ve - ignition on. To get low speed to work, you have to connect the other TWO wires from the motor to ground (high speed runs if only one wire is connected to ground). As the colour codeing on mine was gone, I had to figure out which wires were which by a bit of trial and error. Now the wiper replacement switches (i.e. not the Hooters original) only ground one feed from the motor at a time, so to get around this, you need to install a power diode between the two switch terminals connecting to the motor. This gives - low speed, both terminals ground, high speed - one terminal ground. Again trial and error to get the diode ponting in the right direction. Make sure your fuses are O.K., and good luck! (Actually I used a low-amperage trickle charger as a 12V source for the "trial-and-error" bit.

Rob.

 

[piman]

Hello ZM,

looking at some books I have the TR250 and TR6 have different motors, your motor should have a 5 wire plug and socket connection.
The wiper switch has power and selecting low or high feeds power to the wiper motor. The colours to the switch are green - supply, red\light green - slow speed, blue\light green - high speed, brown\light green - pulse (if you have that facility)
The wires to the motor socket are red - low speed, yellow - high speed, blue - pulse. Pulse (or jog if you prefer) runs at slow speed also.
If you unplug the motor from the loom and apply 12v +ve to the red terminal and see if it runs this will prove the motor. I don't think it will run in high speed if there is a slow speed brush problem. (It is a three brush motor)

Alternatively just unplug and switch on the wiper switch to check for voltage.

Alec

 

[alwaysride]

On my wipers high speed was not working. It was an easy fix:

1) the wiring was fine
2) took apart the motor and found that one of the brushes for high speed was stuck in it's housing
3) lubed the housing of all brushes
4) lubed the bearings while I was in there.

Works like a charm now!

 

[piman]

Hello Ar,

"lubed the housing of all brushes",

you did that with what?

Alec