Hi again thanks for the reply and you were spot on ,there is no fuse fo the coil/renix unit supply ,but the circuit does run through the fuse board and that circuit was burnt out .
So the repair was to take the switching wire to the board and put a remote fuse holder in circuit with a 10 amp blade fuse and everything is now fine,many thanks again for your help Ta Al.
Glad it works, cheers!