73 PA-28 180 Throttle Switch?

[Hang 4]

Doing some minor clean up on the rats nest of wires from my GFC500 installation. Everything works, but nowhere near what i would call "neat". In the process of looking around I noticed a switch that is depressed when the throttle lever is put to full. It clicks nicely, but one of the two terminals has a wire that has been cut. For the life of me I can't figure out what it might do? I suspect it's been like that for the 5 years I've owned the plane and there is no obvious "other end" hanging around.

Anyone know what it's for?

I'll have an A&P do any fixing required, I'm just trying to understand what it could do.

 

[Bell206]

Anyone know what it's for?

Do you have an air conditioner?

 

[Hang 4]

Bingo! - was originally equipped with AC, since removed. That explains the cut wire. Presumably to shut AC off on take off if you didn't follow the checklist.

Thanks, one less worry

 

[Gary Ward]

Nitrous oxide injection at full throttle? If not than that is what I would wire it for.