Assuming you are at the left side light, and Jayco is following wiring color from the 7-pin harness, then the green wire is the brake/signal wire. The black "should" be the marker lights, and the white should connect to the trailer frame (both common and ground).
HOWEVER, I would take nothing for granted when it comes to trailer wiring. Grab your DVM and confirm. Turn on the marker/running lights and see which wire gives you +12VDC (if you get -12VDC, you have them reversed). Do the same with the green wire and the flasher or brakes engaged.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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