From the bloggers at Do It Yourself RV.
Any RVer with a screwdriver can replace the socket for their trailer tow lights/brake wiring harness by following 10 simple steps. Similar steps would be followed to replace the 7-pin trailer plug at the end of your cord. You’d just need the male half of the unit.
7-pin trailer cordTools you’ll need:
Screwdriver and/or nut driver
Needle nose pliers
Replacement part for your 7-pin trailer cord socket (get the model and part number)
For fifth wheel owners: Remove the four screws that secure the trailer cord socket to your truck bed. Gently pull the socket and cord out just far enough to comfortably do your repair. And if your truck doesn’t have a trailer cord socket in the bed, now is the time to add one so the cord doesn’t drape over the tailgate.
For travel trailer owners: Follow the same procedure for bumper-attached sockets. Be gentle when removing the socket.
Now it’s time to release the wiring harness. Notice the two small screws outside of the broken 7-pin trailer cord socket: remove them along with the screw plug that secures the wires at the bottom.
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