Sounds like the fan fitment was not completed or it was just switched manually by the driver.

I need to re-wire my car, the cut about MGB loom is a right mess - next winters job I think.

Cheers
Jeremy

Jeremy, That would make sense as the green/red and red wire are visible and by the rad and the builder of the car, who left a very comprehensive history of the build with lots of diagrams etc mentions the fan switch and it is still there on the dash. What threw me was that in the box of bits was a top hose sensor/switch so I assumed it had been fitted but I guess he/she never got around to it so the black/yellow wire will likely be still wrapped up in the harness outer binding It does appear that the builder used an optional TA harness so I guess I'll just undo the Spiwrap binding and look for it.
Regards

Hi David,

The information I have states that the red wire - Main feed to all circuits mastered by sidelamp switch. The red/Green wire - Direction indicator switch to left-hand flasher lamps. However, this very much depends on how your loom has been altered...!!

The Relay to radiator fan motor should be a black/green wire and the Radiator fan motor to thermal switch should be black/orange.

Regards

Paul

Hi Paul< would love to give you a ring but have mislaid your number. Please will you email it to me again at dafyddcochparc@hotmail.co.uk
Regards

Hi Dafyddcoch,
Have a look at Car Builders Solutions, down load there catalogue page 195/198 explains all about wiring,this has helped me once or twice.