A total newbie to vehicle wiring so please excuse my ignorance as Ill probably be posting a lot over the next couple of weeks!
Im fitting my loom from premier wiring and want to know how the cooling fan works. I have the live feed but how does the fan know when to come on. I presume it needs a sensor/thermostat but am not sure further than that......

Also, what are the two electrical outputs from the MT75 gearbox are for? Im assuming one for reverse light?

you need a fan switch, that comes on at a preset temperature. Or you can have some that you can set the temperature u want it to switch at

Normally the live goes to a sensor in either the rad', engine or top hose and then to the fan then to earth. What rad are you using? Polo ones have a boss to take a fan switch. Alternativly you could take the live via a manual switch, but that riscs forgetting to switch it (or split the live and do both so have an overide switch)
The 2 wires to the gearbox are probably live feed to the rev' switch and then return to the light I'd assume.

[Edited on 16/5/11 by adithorp]

The multi pin mini timer plug on the side of the box is the reverse switch and the 3 pin plug on the tail is the speed sensor for the ecu on the sierra/ granada ect.

I run my telemetrix gauge from this. Ultra smooth compared to magnets on the prop and nothing to fall of.

The fan takes a fair bit of power so will need to be run through a relay.

Thanks lads