I have a switch to the right of the steering column below the trip setting knob located on the dash. When the switch is on it has a yellow light at least it looks yellow now and opens a large relay adjacent the fuse boxes but not the typical black round relay. On the relay it is written REF 413 12V.
What is the switch for possibly a gas heater or what?
This was a european car.

Thanks for your help.

Robert Jaye
#1234
1971 911S Targa