What is the blue turn signal wire for?

Alex01

Waiting on USA revolution shafts since November
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Truckee, CA
I'm cleaning up the wiring while installing my new fenders. I'm going to cut the factory harness so I dont have a large bundle of wires tucked in the fender. I see I need black, tan, and black yellow to run the running lights and side markers but included in the harness is a blue wire.

What is the blue wire for? I searched the FSM but didn't see it. It's attached to the same area as the side marker and blinker. (I dont recall unplugging the pictured connector)
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