Trying to install a 7 pin trailer connection
Only four wires on original 5 round pin connector
Missing back up light,trailer brakes, and 12 volt ignition.
Found a loom with 6 wires near hitch numbered
EX1 to EX6 2087,they do not seem to be connected,. Can any one tell me what they are for.
2003 gv 320
Spare wires. Likely run all the way to the front of the coach.
extra wires (https://www.foreforums.com/index.php?topic=14978.0)
If you have the owner's manual for the coach, there will be a wire list in it to help with any future tracing as well
Reverse light wire is there. Use one of the "extra" heavy wires for charge wire, the other for brake control.
As Michelle said, they are in the front, rolled up lower left under dash cover.
There are also a few wires that go from that area to above driver, not to be confused.
You will have to make your charge wire and brake connections yourself.
BTW, if you don't have a combiner at rear, you will need to install one for combined light on trailer.
Chris