Truck harness or trailer harness issues.

Kelpike wrote:
This is a runoff from a previous post I had. I'm not getting brake lights or blinkers on my camper. From a suggestion on my previous post I checked the terminals of the harness on the truck. Yellow was 0 with truck running, 12.5 with brake pressed, jumped up and down with left blinker on. Green was 0 with truck running, 12.5 with brake pressed, jumped up and down with right blinker on. Red was 13.4 with truck running, 13.2 with brake pressed. Brown was 13.4 with truck running, 13.2 with brake pressed. Is my truck harness wired wrong?

Your truck is wired correctly. the turn signal and stop lights share the same wires. So in effect you have two brake light wires, (a left brake light and turn signal wire and a right brake light and turn signal wire).

Kelpike wrote:
Yellow was 0 with truck running, 12.5 with brake pressed, jumped up and down with left blinker on.

This is correct operation. Yellow is your left turn signal and brake. It should read 0 when the truck is running. If you step on the brakes it will go to a steady 12v. Put on the turn signal and the voltage will jump up and down as if the light is blinking.

Kelpike wrote:
Green was 0 with truck running, 12.5 with brake pressed, jumped up and down with right blinker on.

If you are referring to blade 6 in the diagram this is correct operation. Green is your right turn signal and brake. It should read 0 when the truck is running. If you step on the brakes it will go to a steady 12v. Put on the turn signal and the voltage will jump up and down as if the light is blinking.
If you are referring to pin 7 in the center then you are wired incorrectly.

Kelpike wrote:
Red was 13.4 with truck running, 13.2 with brake pressed. ?

Red is battery power. It is behaving as expected.

Kelpike wrote:
Brown was 13.4 with truck running, 13.2 with brake pressed.

Brown is taillights also called the running lights. It should have power when the truck lights are on. It is behaving as expected.

But don't confuse these colors with the wire colors in the umbilical or the trailer. The wire colors are probably different. You really need to take your meter to the trailer and check what each wire does regardless of the color. Remember, the wire colors may lie, the meter will not.