[Trevor]

A curly one indeed! You say that you have replaced the fusible link so that I presume that this had melted when the fault first occurred. However after replacing it only lower rated fuses blew.

If this assumption is correct it would indicate that you originally had a high current short in power wiring which has now cleared itself but heat from this short caused damage to adjacent wires in the loom which remains in the form of shorts to earth as well as between separate circuits or alternatively causing sneak circuits to earth.

Did something occur prior to the fault developing which could have caused mechanical damage to the loom? Has anything been dropped into contact with any exposed terminals in the system? This would of necessity have to involve multiple terminals e,g, the fuse box and on second thought does not appear likely.

Have you made any mods. which could have lead up to a fault. Think over everything you can suspect as possible. Use your nose it is likely insulation has melted and if so there may be a stink still detectable. The involment of one radiator fan would indicate that the fault is in the engine bay as the feed to the fans is unlikely to route from any other part of the car.

Unfortunately I do not have a wiring diagram so can not attempt to trace possible fault paths but hope the above suggestions may be of some help. If you discover anything which may provide a further lead post more info.

Best of luck, Trevor.