It has stopped working just when I need it!
Have set about testing supplies / feeds and I get zilch from the feed in, despite the fuse being OK.

I tried simply bypassing the switch and testing the 2 speeds simply by introducing 12VDC - again nothing - so it could be an earth issue...

I'm thinking of doing away with the Binnacle mounted switch and using a RDX / Carling switch and simply re-wiring the entire thing.

But I do need to be able to de-mist the screen!

Any other thoughts / hints / tips?

If it's not doing anything with the switch bypassed (i.e. wired directly to 12v) is sounding like either a jammed or dead motor

yep, sounds seized/dead

Exactly the same as mine last week!

It lives!

Re-wired it. Blows a good 'un!