There are two pins on your trailer plug that you put a jumper on to make all the lights come.
I have not done it in a while, but on my plug, I jumper the two plugs that are on either side of the guide nipple.
Some people find it very distracting and others like it.
HAPPY CAMPING!! :D
Daryl and Sandy
2013 Eagle 314BDS
2012 Ford F150 Platinum, 4 x 4 Crew Cab with Ecoboost