There should be a electrical junction box mounted just at the end of the trailer 7-way cable connection that goes to your truck. All of the seven wires are terminated in this junction box to give a good junction point to replace your damaged trailer connection cable. These wires usually use the large YELLOW twist-on wire nut connectors and the wires are color coded. Just find the the ones for the running lights and the turn signal lights. GOTO Etrailer.com for color code info and lots of other trailer light information.
My trailer uses the standard metal electrical junction box with a lid installed just under the trailer frame near the the trailer tongue area.
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"