3 speed fan wiring diagram.

galaxyclass · 30th May 2015, 19:07

Does anybody have the wiring diagram for a 3 speed fan? I have just removed my fan and want to confirm correct switching is taking place at the plugs.

Thanks.

SD1too · 30th May 2015, 20:05

Quote:

Originally Posted by galaxyclass

I ... want to confirm correct switching is taking place at the plugs.

Umm, OK John. The only circuit I have is that which I drew myself after inspecting my own fan's wiring. I hope this will suffice:

Earth the blue wire (C0088) to trigger the slow speed relay.
Earth the blue/yellow wire (C0088) to trigger the medium speed relay.
Earth the blue/red wire (C0019) to trigger the fast speed relay.

Just don't expect the motor to react by running at slow, medium and fast speeds!

Also, when you separate C0019 it will cut the positive supply to the relay coils.

Simon

galaxyclass · 30th May 2015, 20:10

Thank you Simon, I'll be testing it out in the morning. Ive removed the fan already so will test the relays, test the car is switching correctly and then move on to the brushes, I have a feeling the brushes have worn. There is no indication this unit has ever been removed so it's done well to last 13 years.

Dragrad · 30th May 2015, 20:16

This could be useful to you...

http://www.the75andztclub.co.uk/foru...249#post985249

SD1too · 30th May 2015, 20:32

Quote:

Originally Posted by Dragrad

This could be useful to you...

http://www.the75andztclub.co.uk/foru...249#post985249

That's for the diesel Andrew! John has a ZT 190.

Simon

Dragrad · 30th May 2015, 20:46

Quote:

Originally Posted by SD1too

That's for the diesel Andrew! John has a ZT 190.

Simon

Ah...... missed that bit

galaxyclass · 30th May 2015, 21:01

It's no problem, interesting reading none the less.

galaxyclass · 31st May 2015, 12:17

Well, after confirming correct operation of fan relays I pulled the motor apart to be greeted by a worn negative brush. There seems to be evidence of water ingress too. Now to decide whether to replace the brushes or get a new motor.

SD1too · 31st May 2015, 12:32

Quote:

Originally Posted by galaxyclass

... to be greeted by a worn negative brush.

That's the usual problem with the 3 speeders John! Actually yours looks in pretty good condition. As you've come this far, why not renew the worn brushes? Prior to dismantling, was the motor running at the high speed triggering point (112°C)?

Simon

galaxyclass · 31st May 2015, 12:39

I never noticed the high speed Simon. I rigged up a battery to the relay box to see if the fan operates, it didn't operate when any relay was energised, however I'm not sure if all three relays have to operate to trigger the high speed. Ive not looked at the board properly yet but would assume if the negative has no connection then the fan can't operate at all.

30th May 2015, 19:07	#1
galaxyclass Posted a thing or two MG ZT+ 190 Join Date: Apr 2012 Location: Manchester Posts: 1,047 Thanks: 119 Thanked 59 Times in 58 Posts	3 speed fan wiring diagram. Does anybody have the wiring diagram for a 3 speed fan? I have just removed my fan and want to confirm correct switching is taking place at the plugs. Thanks. __________________ Mods done - Spyhole mod - Xenons - Blue dash lights (except message centre) - VIS indicators - Illuminated sun visors - Drivers grab handle - Smiley plate - Rear electric blind - Handbrake compensator. Mods to do - Powerfolds - Better ICE - Headlight washers - Heated seats - cruise - And loads more i can't remember. [SIGPIC][/SIGPIC]

30th May 2015, 20:10	#3
galaxyclass Posted a thing or two MG ZT+ 190 Join Date: Apr 2012 Location: Manchester Posts: 1,047 Thanks: 119 Thanked 59 Times in 58 Posts	Thank you Simon, I'll be testing it out in the morning. Ive removed the fan already so will test the relays, test the car is switching correctly and then move on to the brushes, I have a feeling the brushes have worn. There is no indication this unit has ever been removed so it's done well to last 13 years. __________________ Mods done - Spyhole mod - Xenons - Blue dash lights (except message centre) - VIS indicators - Illuminated sun visors - Drivers grab handle - Smiley plate - Rear electric blind - Handbrake compensator. Mods to do - Powerfolds - Better ICE - Headlight washers - Heated seats - cruise - And loads more i can't remember. [SIGPIC][/SIGPIC]

30th May 2015, 20:16	#4
Dragrad This is my second home *None DROWNED** Join Date: Aug 2007 Location: Cardigan Posts: 33,339 Thanks: 1,257 Thanked 1,664 Times in 1,081 Posts	This could be useful to you... http://www.the75andztclub.co.uk/foru...249#post985249 __________________ Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER...

30th May 2015, 21:01	#7
galaxyclass Posted a thing or two MG ZT+ 190 Join Date: Apr 2012 Location: Manchester Posts: 1,047 Thanks: 119 Thanked 59 Times in 58 Posts	It's no problem, interesting reading none the less. __________________ Mods done - Spyhole mod - Xenons - Blue dash lights (except message centre) - VIS indicators - Illuminated sun visors - Drivers grab handle - Smiley plate - Rear electric blind - Handbrake compensator. Mods to do - Powerfolds - Better ICE - Headlight washers - Heated seats - cruise - And loads more i can't remember. [SIGPIC][/SIGPIC]

31st May 2015, 12:39	#10
galaxyclass Posted a thing or two MG ZT+ 190 Join Date: Apr 2012 Location: Manchester Posts: 1,047 Thanks: 119 Thanked 59 Times in 58 Posts	I never noticed the high speed Simon. I rigged up a battery to the relay box to see if the fan operates, it didn't operate when any relay was energised, however I'm not sure if all three relays have to operate to trigger the high speed. Ive not looked at the board properly yet but would assume if the negative has no connection then the fan can't operate at all. __________________ Mods done - Spyhole mod - Xenons - Blue dash lights (except message centre) - VIS indicators - Illuminated sun visors - Drivers grab handle - Smiley plate - Rear electric blind - Handbrake compensator. Mods to do - Powerfolds - Better ICE - Headlight washers - Heated seats - cruise - And loads more i can't remember. [SIGPIC][/SIGPIC]