Originally Posted by Peddler
I just added a 12 awg wire for the feed from the brake controller to the trailer plug (Winnebago/Workhorse did not include it until after mine was built).
Although a single axle brake system would normally be ok with 14 awg, I thought it best to go up a gauge due to the length of the run. My dolly has two grounds to its 7 pin plug, a 14 awg for lights and a 12 for brakes, (both to the same pin).
The motorhome ground is 14 awg. As the ground from the rear of the motorhome to wherever carries any and all current going to and from the dolly (lights and brakes) should I add a second or heavier wire to the frame from the plug?
I think if you look a little deeper you'll find the wires were installed on the incomplete chassis. Winnebago did not extend them from the frame to the trailer socket at the rear of the coach.
When the incomplete chassis comes to the body builder the wires for the trailer hitch are folded back and taped inside the main wiring harness on the left frame rail. Winnebago installs the socket at the rear of the coach and extends the wires from the main harness. For some reason they generally extended only the wires for the tail lights and brake lights. The ground, power for electric brakes and power for interior trailer lighting and battery charging are left taped in the harness.
I ran into the same problem on our 01 Ford chassis. When I asked why they only extended some of the wires they didn't have a good answer. At the time they were expecting the customer and the dealer to have a conversation as to whether the customer was planning on pulling a trailer or dolly with electric brakes or internal lighting. The dealer was supposed to extend the necessary wires to the hitch socket.
I think they had so many customers that did the same thing you've done they finally decided to extend all the wires.