Tapping into reverse lights/power

[scottg918514]

My Mav only has 4 way flat trailer connector, but have a boat trailer w/ 5 way and surge brake lockout while in reverse. So, I want tap into the reverse lights. After I unplug the taillight harness, which wire am I looking for? Is it the light blue, like the trailer harness? Thanks.

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[BlueSpec1]

Green/Brown per: https://www.mavericktruckclub.com/f...ybrid-maverick-diy-how-to.63179/#post-1059984