2 Trailer Plugs?

Is there a circuit number on the wire? On Petes it's usually a small metal tag wrapped around the wire at each end or, printed on the insulation.

 

ABS just needs one hot wire, so it is just prewires for odd trailer options weather you need it or not. It could be used for any thing else that needs hot power on the trailer int he future. Its just like the blank switches on the dash some trucks have so you can add stuff.

 

yeah it has 4 optional Switches on the dash that are wired. Maybe one of those can control a dump valve on the wire

 

7 wires, 6, 4, 2, 1, you can get many configurations when the standard 7 ain't enough.

I bought 100 ft. of 4/14 and a coiled 15 ft. for one of my winter projects on the never finished truck. I'm using the ISO yellow plugs. Dump valves, back up lights, strobe. I'll be able to do some stepping with both axles when I'm done.

 

i learned after 18 months that i needed to run trailer aux switch to power trailer abs in my cascadia it has 2 plugs on bunk but i only use 1 plug cord .. i had trailer abs light up momentary on dash when applying brakes and was told thats normal ,with aux switch on it doesnt light up .

 

Yes, it's normal if the the aux wire has no power. Without power to the blue center pin, then ABS will get power from the brake lights. So it'll power up and do the bulb checks every time you step on the brakes. Once it has power at the blue wire, it'll only turn the light on for a few seconds during start up.

 

Europeans switched to 15 pin plugs now. There are rear light and rear fog lamps wires there, second 7 pin plug is for trailer EBS power supply and CAN. So I tow European trailer with my freightliner and I have 3 plugs.