been poking around the switch & I think it's an isolator wires from switch go to the dizzy & the coil [?] I think the flashing red light is a dummy alarm :I but got distracted trying to remove the dead ariel for a new one to get the stereo working but didn't succeed [)]YET [}]
Commer Dandy by Dandy Caravans
The Colonel Mustard
no plumbing required just wires & fuses [^]
done a quick search on these it seems it warms the water while your engine is running from the alternator so doesn't drain the battery & CUTS OUT AT 40DEGREES sorry didn't mean to shout so always have hand washing facility which is great [8D]
Commer Dandy by Dandy Caravans
The Colonel Mustard