System Heat Switch

[rguy]

Can someone advise. I have a 01 HR Ambassador and replacing the System Heat Switch. I believe the old one was hooked up wrong plus it is bad. The switch is a lighted three prong Sigma. One end prong is brass looking with the middle and other end prong being copper looking. Coach wiring to the siwtch location is red, white, and blue. No darned diagram was included in the package. Can anyone advise on which wire is connected to which prong or a diagram somewhere. Really appreciate the help. rguy

[InPursuit]

the white wire is (probably) common/neutral and needed to make the indicator work when the circuit is closed...

the other wires are the 12V power line (in) and load (out) to the heater thing.

if two terminals are X and one is Y... I'd assume the one (Y) is the different one.
But I don't assume anything with electricity and suggest you don't either.

almost any simple VOM can test the continuity of the switch. it will also verify the line & load wires. use one.

[rguy]

OK. Thanks a bunch. Really do appreciate it and will do just that.
Ron