On Mon, 22 Jan 1996, Denise Thorpe wrote:
> Fellow MG'ers:
> After I got the mechanical situation together, I went after the electrical.
> Scott Hower had kindly faxed me a wiring diagram for a late B and this
> helped a lot. But, even though everything on the fax is perfectly legible,
> the drawing of the wiper switch doesn't really tell me how the switch works
> and I have no late model B to look at. From the drawing it looks like either
> the R/LG and N/LG wires are connected, or the G and U/LG wires are connected
> (the black wire goes to ground) but these don't work. From experimentation I
> discovered that power to the R/LG wire makes the low wiper speed work and
> power to the U/LG wire makes the high wiper speed work but neither of them
> would park. I could make the low speed park by applying power to both the
> R/LG and N/LG wires and then removing the power from the R/LG wire. But I
> couldn't find any combination of wires with/without power that would make
> high speed park. Some of the combinations I tried made my jumper wire very
I'm going from memory on this but my 68 has a two speed motor, and I
played with fixing it this summer. (I don't know if it matches the 80
motor). The switch has three positions. None of which are "off" or
open. Call these positions, Park,low and high. 4 wires go to the
switch, power, low, high, and park-power.
the switch then works as follows
Park: connects park-power to low wire. Park power cuts out when the
motor hits the park switch.
Low: connects power to low side.
High: connects power to high side.
The motor has 5 connections. Ground, power, low, high and park-power,
the park switch connects power to park-power until the motor hits the
park position. Unless your wipers are parked there should be a very low
Note this is for a 68 Canadian spec (metal dash) B so YMMV
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