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Windscreen washer wiring woe
steve8274 - 26/4/13 at 12:04 PM

Hi all
Still struggling with wiring washers on kit.
Sierra stalks. Wrote on here few weeks ago, and it was suggested to check the 2 wires and wire as a simple switch. Well the checked the 2 wires with multimeter, and there when both wires touched, there is continuity until the switch is pressed and this breaks the circuit. I was expecting this to be the other way round.
Can anyone explain this and even better, how to remedy it to get the pump to work from the switch
Thanks in advance
Steve

Dusty - 26/4/13 at 03:37 PM

There are two possible sensible wiring configurations depending on the year of the column switch.

If pre 87 with a part number 83BG***** then terminal 53C on the column switch is a switched earth. Wire a fused live to the washer motor and wire the other side of the motor to 53C. If the motor sucks rather than squirts reverse the wires on it!

If post 87 with part number 87BG**** or 91BG***** then terminal 53C is a switched live. Wire an earth to one side of the motor and the other to 53C. Again swap wires if it sucks. (Don't bother with the W terminal. It's an earth.)

[Edited on 26/4/13 by Dusty]

steve8274 - 26/4/13 at 06:19 PM

Thanks for the response dusty.
However I tried the latter option, positive to pump and connected earth to 53c. Pump operates all the time unless I operate switch. Obviously reverse of what I need.
If it makes a difference, they are from a 92 plate sierra.

scimjim - 26/4/13 at 07:19 PM

Do you have rear wash wipe (on the stalk)? The wiring for this is different and you must use W as the earth supply.

steve8274 - 26/4/13 at 08:24 PM

The switch does have a rear wash wipe option on it. One thing I have noticed is that both pins 53c and w appear to be earths.
Pin 31(spade connector on top of column) is wired to earth. It has been suggested I wire this as live and it should fix it. Has anyone heard of this. Everything else is working so not sure if changing this will cause damage or stop anything else from working.

scimjim - 26/4/13 at 09:01 PM

no, no, no :-)

do you not have a wiring diagram? if you make 31 live it will not end well!

steve8274 - 26/4/13 at 09:25 PM

Thought so. It's just what someone who usually is very good with electrics had suggested it. I doubted it was right so I hadn't tried it.
Only wiring diagrams I have are from Haynes manual and a few diagrams from the forum

scimjim - 26/4/13 at 09:45 PM

Sierra Haynes manual (OWM903) p458 shows wiring - stalk 165 internals (with & without rear wash/wipe) is shown on p451.

Dusty - 27/4/13 at 01:16 PM

quote:
positive to pump and connected earth to 53c

Can I point out I suggested for switches later than 87BG*****

negative to the pump. Other pump terminal to 53C. NOT positive to pump!
53c supplys pos current when on, earth when off.
So if you give the motor a pos supply and it can earth through 53C when the switch is off and the pump will run constant till you switch the switch on. Then the pump will get 12v from both directions and stop. Just as you describe.

Don't use 53A or W

[Edited on 27/4/13 by Dusty]