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Old 1st February 2021, 19:57   #11
SD1too
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Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

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Originally Posted by cbr1100xx View Post
Hi simon ... I have a multi meter so what would be the best way of checking the wiring.
  1. Large relay on the RHS, thick red wire. Place your voltmeter between there and earth. Turn on ignition and press the windscreen demist button. Do you see 12v?
  2. Middle relay, thick grey wire. Place your voltmeter between it and earth. Locate trinary switch in refrigerant pipe at rear RH corner of engine bay. Bridge pins 2 & 3 (yellow/grey & black wires). Turn on the ignition & press windscreen demist. Do you see 12v?

Simon
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Old 3rd February 2021, 16:29   #12
cbr1100xx
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Took the fan apart today and hopefully one of you nice gents will say if needs new brushes or lobbing in the hedge.
And anyone know what size screws are needed as none survived.
The back cleaned up ok , first time I've used the blaster in anger.

Stan
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Old 3rd February 2021, 16:56   #13
vitesse
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One brush is missing isn't it, otherwise the "board" looks OK, I've even used sand at a distance to clean that up too.

Commutator is a different matter and depends how deep that score goes, but on the other hand what have you got to lose? Try and grind it down and see. I don't have a lathe or anything fancy, instead I put the shaft into a drill and rotate against a file to get rid of the coarse material, then sandpaper, and finally score the segments with a Stanley type knife.

Good luck
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Old 3rd February 2021, 16:57   #14
chris75
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2001 Rover 75 2.0 v6 Connoisseur Saloon

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Thanks Simon, very few chip vans here and I've never worked on one.

Mike
All the ECUs have chips in them ...........
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Old 3rd February 2021, 17:15   #15
kelvo
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Quote:
Originally Posted by cbr1100xx View Post
Took the fan apart today and hopefully one of you nice gents will say if needs new brushes or lobbing in the hedge.
And anyone know what size screws are needed as none survived.
The back cleaned up ok , first time I've used the blaster in anger.

Stan
Commutator looks pretty knackered to me with the wear off the diameter plus the big burn marks across the comm bars. Judging by the 'brushes' it's only been running off the pig tails. This may also be a sign of burnt out windings.

I would see if the comm will clean up, use a strip of fine sandpaper to get it back to nice shiny copper and clean up the commutator slots. When I was an apprentice at the railway depot dealing with DC motors, you slot and vee the grooves. Use a thin blade to clean out the slot, then run a 'V' shaped blade across the slot and then a quick run with sandpaper to take any burrs off. Blow out any dust (or vacuum out)

You may be lucky. Another thing to do is wrap a few strands off bare copper wire around the commutator and check resistance to the shaft of the armature, this will make sure that none of the windings are shorted, on a comm that size I would expect a good few thousand Ohms resistance if good.
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