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Intermittent rear wiper


Mo Murphy

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Afternoon all,

I'm trying to get the rear wiper working intermittently using a front wiper relay.

Td5 push button switch and a rear wiper of unknown vintage.

I can't get it to work. 

Attached is a picture (old skool 😉) of what I've worked out.

Could someone with some electrical nous tell me how it SHOULD be wired up ?

I can then compare that to what I've been trying and see where I've been going wrong 😬

Many thanks 

Mo

 

20200925_133302.jpg

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Thought occurs that 2002 on TD5 dash switch switches the earth.

So I may need a 4 pin relay to change that to switching live.

Or put an ignition live to the switching terminal on the relay and switch the relay earth terminal. 

Progress, I think ...

If these musings fail to make sense please say so !

Mo

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If its a TD5 dash with the later push switch, you need to change the existing relay on the rear door and swap it out for the intermittent one. Years ago I used to do a conversion kit available via a well known auction site. As such I don't have the actual circuit diagram. PM me and when I'm back home after the wknd I'll see if I have still have any left.

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Thanks Simon,

It seems to be quite straight forward, having researched it.

I fear the relay I'm trying is duff, so tomorrow, weather permitting I'll take the known good one out of the front and try it on the back.

In the meantime I've ordered a replacement which I hope will arrive soon.

Mo

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Right, duff relay replaced and success !

Rear wiper now on a 5 second intermittent wipe.

Rear washer activates 5 wipes of the rear screen but only does so if the rear wiper is turned on.

I suspect this is because I'm switching the relay with the earth so the relay only operates if the earth is connected.

I'll wire up a relay to switch the live on the j pin and then have a permanent earth which I hope will resolve that one.

Hope this helps someone.

Old skool, back of a bit of scrap paper wiring diagram included.

Mo

 

 

 

16012207550602708334535884807256.jpg

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Just to finish up, earth switching the intermittent relay changed to live switching with an additional 4 pin relay.

Now have intermittent wipe when the button is pressed and wash / wipe works all the time regardless of rear wiper button. 👍

Mo

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