I think that is a design flaw in the early Ford wiring. The fan switches have to switch the entire load of the fan and my H4 burnt through several and also the ignition relays too. These are the green relays in the MK3 Fiesta fuse box.

Bills suggestion of using the fan switch to trigger a relay should help to prolong the life expectancy of all components within that circuit.

Regards,
Steve

On 22 May 2019 19:57:52 bill <bill_green_2...@hotmail.co.uk> wrote:
On my other kitcar I went through a few of the thermostatic switches, a pair welded themselves in so the fan ran continuously, finally I had the thermostatic switch operate a relay which then ran the fan, result, no more switch’s failing,
Bill


Sent from my iPhone

On 22 May 2019, at 19:43, Dave English <dandh.engl...@gmail.com> wrote:

Hi James.

I didn't get as far as the fuse. After disconnecting the switch, I used a wire link across the plug to check the fan worked, it did, so the only bit that could be broken was the switch.
It's now been replaced and everything is sorted - until the next time!

Regards
Dave E

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