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Toy4us
04-30-2018, 06:21 PM
I was unhooking forme the trailer and when I pulled away the trailer plug snagged my hitch and pulled 4 wires out of the junction box connected to the trailer. I figured them all out but the black wire. There is no empty connectors left I dont no if it was hooked into one with the other wires. Any body have any pics or info on this

chuckster57
04-30-2018, 06:48 PM
Black is usually battery positive. There may be more than one black wires joined together.

Toy4us
04-30-2018, 07:08 PM
Black is usually battery positive. There may be more than one black wires joined together.

The black one are together on the right they were hot when checked. The one I can't figure out is one the left

chuckster57
04-30-2018, 07:12 PM
Can’t tell by the pic, I’m on my iPad so pic is small. In the junction box the blacks should be:
Positive from battery to trailer
Positive charge from Tow Vwhicle
positive charge from trailer converter
positive lead to break-away switch

Tinner12002
05-01-2018, 02:52 AM
Looks like a loose unconnected blue wire, not black. From my quick research the blue should be for your trailer brakes. It also said not to rely on color coding as all manufacturers don't always conform.

chuckster57
05-01-2018, 03:09 AM
Looks like a loose unconnected blue wire, not black. From my quick research the blue should be for your trailer brakes. It also said not to rely on color coding as all manufacturers don't always conform.


If it is blue, then it is the brakes. In every trailer I’ve had the opportunity to open the junction box, 3 wires are all the same,

Black is battery positive
White is battery negative
Blue is brakes

Toy4us
05-01-2018, 04:01 AM
Yes i haven't hooked the blue up yet. The black does not test positive anytime when tested.

chuckster57
05-01-2018, 04:11 AM
Yes i haven't hooked the blue up yet. The black does not test positive anytime when tested.



It depends on where it goes. If it goes back into the trailer, it won’t show any voltage unless plugged into shore power.

Steveo57
05-01-2018, 04:22 AM
This is a picture of my box. 2018 Cougar 26RBS.16257

flybouy
05-01-2018, 08:41 AM
Yes i haven't hooked the blue up yet. The black does not test positive anytime when tested.

The black may not have voltage applied until shore power or to vehicle is connected. On most trucks, the black will not have voltage unless the truck is running.