Key start switch

[Hadenough]

In the process of tidying up my wiring. Anyone know what the terminal marked 75 on the back of my start switch serves? Seven o clock in the pic,two black wires. Key switch, start and run, no preheat.


View attachment 36221

 

[JumbleDuck]

It looks as if the switch uses the european DIN 72552 codes; 15 is +ve supply, 30 is diesel pre-heat, 50 is the starter motor control. That would make 75 "radio and cigar lighter". What exactly that does would depend on the particular switch, but I'd expect it to go live as soon as the switch is turned. If everything there is engine related, I'll guess oil pressure and temparture alarms. Why not just disconnect them and see what doesn't happen?

http://www.international-auto.com/f...-system/european-din-terminal-designation.cfm

 

[Hadenough]

Many thanks, spot on. During the course of the day I have traced the other end to a switch and two redundant red lights from there it went to a disconnected wire in the engine bay. Explains why I have one engine alarms! Another job! Many thanks for the confirmation.