Newb with controller ??????

[Wallygator]

Originally Posted by Larry

I just checked my setup. The running lights wire is to small to power the trailer running lights. What I think it is for is to power instrument lights in the brake controller. I have never seen a controller that lights up at night, but the wire is probably there just in case you have that kind of controller. I just put tape over the end so it can't possibly short out and then rolled it up. If you put extra gauges in your truck, you could use that wire to power the backlight in the gauges.
The ground wire goes to a ground on the controller. The other end of that wire is already connected to a chassis ground.

Your the man Larry, thanks a lot.

[Phoenix]

I found the following quote on another Tundra Forum. Does this sound like the wire you have left over? -- By the way, I have not idea if the instructions below are correct; so take it with a grain of salt. However, the explanation sounds logical.

"The one thing you do need to pay attention to is that the Tundra tow plug in the kick panel will not supply a proper ground. Tekonsha fixed this problem by adding a second ground wire (White) to this harness which must be attached to a ground bolt. This wire is not inside the jacket like the others so I just snaked the extra ground wire thru the laced cover and attached it to a ground bolt by the tow plug at the kick panel. There all approx the same length and it just looks nicer with all the wires covered by the jacket."

And, if all else fails, read the instructions: Tekonsha