Originally Posted by Curt and Michele
And that's were my problem lies, I pulled the cord out of the junction box and in the junction box is nothing but brown wires, except for hot, ground and electric brakes.
Maybe I should not have put this under Tow Vehicle but figured if I could positively figured out what the yellow wire coming off the TV may go to I could trace it down some how.
Once again Thanks everyone.
If all of the wires are currently disconnected, and you have a volt meter, separate the pigtail wires, strip and tape them individually and plug the pigtail into the truck.
Using a volt meter on VDC (or DCV in this case), monitor all the trailer side wires for the one with 12 volts. That wire goes to the trailer battery and needs to go to the red wire coming from the pigtail. Mark and tape a tag to it.
Next, meter the voltage on the pigtail yellow wire. Turn on the left turn signal and if the yellow end goes to the truck's left turn signal, the voltage should swing between zero and 12-13 volts or so (you may need the truck running).
If so, using a short 5 amp
FUSED jumper wire from the yellow wire, test each brown end in the junction box to see what turns on. If you find the ground wire by mistake the 5 amp will open before any damage is done to the truck. Label the wire with a small tape tag.
Repeat with the right turn signal.
Turn on parking lights and identify the wires going to the marker lights.
NOTE: depending on how your side and top marker lights are wired, 5 amps may not be enough to handle them all if there is only one wire to all of them. The some incandescent bulbs can draw up to 1.2 amps each (LEDs draw MUCH less and 5 amps will always work regardless of how the markers are wired). If the markers draw more than 5 amps, identify all of the other wires first before increasing the fuse to 7.5 amps and then to 10.
The brakes and ground wires will always be "cold" until someone taps the brakes in the truck. Then the brake wire from the truck will show some voltage. The easiest way to identify the brake wire from the trailer side by pulling the breakaway momentarily (long enough to take a reading) as the trailer battery will be sending power on that wire when the break away is pulled. Be quick about it as the brakes will be pulling full power from your battery and may overheat if left on too long (no more than 5 minutes as you will also be running your trailer battery down).
Once you have identified all the correct wires, write down the color code/tag numbers for your particular camper.