LouC wrote:
No do not depend on the trailer ball for the ground. The trailer wiring is ultimately grounded in the vehicle trailer wiring. The white wire in the trailer harness must be grounded to the trailer frame. However even this can be troublesome. What I did was run a ground strap from the trailer tongue (where that white wire is grounded) to each frame side rail. Then ran additional ground wires from the rear end of each side rail to the tail light housings and also to the center rear 3 light unit. This prevents rust or even paint or galvanizing on the trailer from disrupting the ground path.
Hey Lou - Have you ever posted a pic of your wiring setup? I think I'm visualizing what you've done, but a pic would be great.
Picking up a couple of these inexpensive testers can be handy so that you can narrow down where the issue(s) are:
https://www.etrailer.com/Accessories-an ... 20117.htmlhttps://www.etrailer.com/Accessories-an ... t/I26.htmlI have the 7 pin tester for my truck and then the 4 pin tester which I use further back where it converts to a 4-pin flat connector + the backup solenoid wire.
I have had blown fuses in the truck, bad grounds, and most recently (last weekend) I noticed that one of the wires at my 5-pin flat plug had essentially corroded through, which solved an ongoing intermittent issue with my left brake light....