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leylandracer

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Agree, older cars tend not to have these relays, in moderns they tend to be more for the timer facility on intermittent wipe etc. If your wipers refue to turn off then almost certainly the park switch is the cuplrit as above.

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Actually sounds as though you may have a new dodgy switch there! Know anyone with a known good one you try quickly?

Failing this a bit of diagnostics is called for. Do you have a multimeter? If not a bulb with 2 bits of wire will do! At the plug that goes into the wiper motor you will have a number of wires- someone here will be able to tell you all the colours but afraid i can't- easy to work by process of elimination though. You should have the following, with ignition switched on:

1. A live feed (used by park switch) which is live with wipers on or off
2. A feed which is live ONLY with the wipers on
3. If 2 speed wipers fitted, another wire which is live when wipers are on second speed
4. Maybe an earth - not sure as some I think earth via the motor mounting points.

At the risk of stating the obvious, check between earth and each wire for a reading (or bulb lighting up) to verify the above. To check if a wire is an earth, check between that wire and battery positive for reading (or bulb lighting up).

If you end up with two wires live all the time, try wriggling the switch as you mention above, if one goes on and off when you do then you can be fairly sure it is indeed your switch which is faulty (check plugs all firmly in first).

Hope this helps

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Its also a case of ensuring you get the right one as well - some later motors use a sprung terminal on the large plastic gear contacting a terninal in the wiper motor cover, so cables for these do not have the tag.

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