While in the engine bay today I looked into why my fan was not working. Fuse had melted inside the in line fuse holder!!! So took that out and fitted a modern blade type fuse holder instead. Did it properly as well - solder the wires together then put heat shrink insulation over it. The question - what amp fuse should go in here?
Doing its job then . I'd imagine seizure due to crud is probably the most likely fault. The motor'll take a fair old current when it's running.
Mine spins lovely when I took it out and cleaned it so will pop a new fuse in when I'm next out there. Thanks all.