Fan not working.

Flaskie 1

Member +
My fan was constantly running so I put it down to the fan switch on the rear thermostat housing.
Got a new one and fitted it and since then my fan won't run at all.
Iv earthed the single wire that gos to the switch and then the fan will kick in so seems all wiring is in good shape.
Iv also checked all fuses, changed all relays and the fan itself works perfectly.
Can anybody please help?