My 90 wiper switch has a position for a single sweep, but it doesn't work. The low and high speed positions work fine, but with the intermittent rain we've been having the last few days, I was thinking I would like to be able to get just one sweep now and again. So, knowing (or thinking I'm knowing) a bit about electrics(house electrics, TV's but not vehicle), I dismantled the switch to see if I could spot the problem.
I ended up confused and no further forward. The switch body has 4 brass pillars, each of which has a wire coming out of the back. The switch lever moves a spring loaded brass cylinder up and down over the 4. So in the low speed position, the spring loaded brass connects 2 and three; in the high speed position, pillars 3 and 4 are connected together.
It's kinfd of cunning, the spring loaded brass falling in between the fixed brass pillars gives the switch it's 'click stops'.
Now to the bit that confuses me. In the off position, the switch seems to be connecting pillar 2 to pillar 1, and in the single sweep position, it doesn't connect anything together, the spring loaded brass just rides up on pillar one.
The wiring diagram I have is not much use, it shows a blank circle containing all the console switches, and the wiper motor has 4 wires going into it, but no explanation.
Has anyone managed to figure out how this all works?