as above. Just wiring up my wipers with durite switches. The diagram i have shows no relays is this right?

If your switch is rated to switch in excess of the current taken by the wiper start then you will not need a relay.

depends - there is a circuit diagram using 2 relays for 2 speed self parking wipers using a simple switch.

you need to post your circuit diagram for me to make any other comment.

Description

Here.

What size wire would you use?

[Edited on 31/3/10 by Danozeman]

I based my wire size on the thickness of the wires going to the wiper motor connector - assuming that you've got one of those, make a judgement on them.

FYI - the Lucas manual says that the current consumption of a 2-speed motor should be around 4 Amps if everything is in good order, so 16A thinwall cable should be more than adequate.

If your power-carrying wires are quite long, then go up a size to reduce resistance.

[Edited on 31/3/10 by David Jenkins]

the westfield diagram looks standard from what I've seen. The advantage to the Lucas-type switch/no relay setup is that the park function works.

What is your fuse rated at? The switch and wire should be rated more than the fuse else they could 'blow' first - which is expensive and inconvenient even if it doesn't start a fire in the scuttle

I think the worst case current draw is if the wiper motor is stalled by something - in that case you probably want the fuse to pop, but an accidental dry wipe probably shouldn't even if that's a touch above the normal motor starting spike. It may require some experimenting to get right.