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Fault Cleared and incorrect Colour Coding!

A project log for Landy Wiper Control

Sick of having 2 speeds for my windscreen wipers. Nothing a 555 timer can't fix!

tron9000Tron9000 06/20/2017 at 14:220 Comments

So finding suitable access to the screen wash motor through the passenger side headlight, I was able to test it. But looking inside I found there were 2 pump motors, most likely one was for the rear screen wash when this vehicle hadn't had its back end shortened!

I test them by applying voltage from a 12V battery to the correct pins and they both worked!

However with power applied to the vehicle, it didn't which meant there was a break in the wires between switch and motor.

Now I was still under the assumption that the power was fed through the motor by the stork switch pulling one side to GND, as the wire on the stork metal case was black. After much fruitless continuity checking for a 12V feed to the motor connectors, I found a wiring diagram online and found that the washer motor was tied to GND meaning it was fed +12V!

where 28 is the stork switch cluster and 25 is the wash motor (no the wire LGB does not mean its Lesbian Gay or Bi-sexual! It Means Light Green & Black). Upon closer inspection of the switch cluster I found this:

YEP! The Black wire which is usually universal for GND is actually connected to the Green wire which is the feed for all ancillaries! FML! Cheers Landrover! Hell some bloody green insulation tape would have been a least somewhat of a designation!

This meant that I could then correctly determine where my fault was now I knew what was going where, and low and behold, I found the culprit: a wire that had left its crimp, probably fitted by the previous owner, it was buried in insulation tape, no doubt to keep the weather out:

Fresh crimp and a quick check that the wash motor was working, and all was fixed! I am still confused as to how me hooking up the harness caused a wire to disconnect itself from a dodgy crimp!

Anyway at least now I can proceed. My new plan is to wire the switches from the stork cluster to the centre console and then fit in my 555 circuit.

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