Hi - just taken off sorn after winter, so got a little damp in cabin and boot(especially). No indicators/horn/ main beam/ wipers, etc. Thought it was a Steering Wheel Control Module fault. I've noticed now that if I quickly select reverse after starting up, it all starts working again until turn off the engine. Then they'll either keep working or back to square one - bit if I select reverse again, hey presto!

 

Any ideas??

All the wiring and electronics run along the bulkhead. I'd check to see if any of it is wet. Wet front footwells is a good giveaway. Water gets in via the battery tray if the battery tray drains get blocked.