I am getting ready to move my Leer 122 from my old truck to the new one and ran into an unexpected wire in the harness. A majority of the wiring harness is tapped into the driver's side tail light wiring, except for this connection to this purple wire. Anybody know what this purple wire is for? I am going to cut the red wire to remove the Leer harness - any problems with that? Thanks!~

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Did you follow that purple wire and is it attached to the red wire? I just picked up a 100xr and the bed light on the topper was run all the way to battery. I just cut the 4 wires coming from the plug attached to the inside left of the topper as that plug wouldn't fit thru the hole in the bed. Don't know if this helps

 

I didn't chase it beyond the spare tire, but I still have the truck and can take a look. From what you said, the purple/red wire is for the cap's dome light - that makes sense. I actually forgot that it had one! I have never used it. I cut the red wire right at the connector and pulled the harness out. Thanks for getting back to me.

 

I know this is a bit late but the single wire by the spare tire provides power to the "center high mount stop light"......3rd brake light.

Since the left and right tail lights have a shared turn signal/brake light on the same circuit, the 3rd brake light has an individual wire. This prevents the 3rd brake light from blinking like a turn signal had it been tapped into the left or rear tail light.

On the 100XR (and many others) the electrical components share a common ground but get a positive signal from different sources.