Hello, looking for some help with identifying what this pink is for. I did a complete teardown of an RV and rebuilding now. These group of wires are for the rear exterior lighting. I have identified all other wires as running, reverse, and right left signal/brake lights.
When the engine is running the pink wire shows around 15 volts and when engine isnt running it shows around 9 volts.
TIA
(sorry if the is in the wrong section)

 

window grid

 

not sure what that is, rear window defrost?

 

that would be it