원문 게시자: Greg R ,
Yesterday I received and installed the new 7-conductor wiring harness. This is the part that physically plugs into the tow vehicle and runs into the fuse block/power distribution in the trailer. Installation involved pulling the line inside the frame and crimping new connectors on each conductor at the fuse block. A quick test by plugging into the truck and the brakes worked as I hoped! So I'm guessing my theory was correct: the old, mostly broken ground wire was a good enough ground to operate all the trailer lights. But it wasn't enough to support the significantly heavier electical load required by the brakes.