I think I got it.

I tested all the wires from one end to the relay for continuity, all checked out okay. Then with the main power from the battery to the relay and there was something missing. I pulled out the cb and it wasn't blown but one of the tabs was cracked, must've been when I put it in and it just finally came apart.

I put a new one in and the fan blows again. Now I gotta go for a drive to see if that sender still works, finally the fun part.

Thanks a lot for your help Pat,

Sean