Forum Discussion

candjmc's avatar
candjmc
Explorer
Oct 22, 2015

Cargo trailer battery?

We bought 2006 continental cargo 7x16 enclosed trailer. I am trying to figure out interior light, looks like red,blue,black, and i believe white coming out of the wiring harness going uo into the trailer,but when I pulled off wall switch there was a yellow one there. .?

15 Replies

  • RoyB's avatar
    RoyB
    Explorer II
    ETRAILER.com is a good all around source of INFO for anything trailers...

    Roy Ken
  • So red and white would be typically used for interior light
  • 4x4van's avatar
    4x4van
    Explorer III
    For any trailer, you'll of course have running lights, right turn/brake, left turn/brake, and ground. If your trailer has brakes (my 16x7 enclosed trailer does), then you'll also have a wire for that. The standard trailer wiring colors are:

    Brown=Running
    Green=Right turn/brake
    Yellow=Left turn/brake
    White=ground
    Blue=electric brakes
    Red=battery/aux (this would typically be used for interior lighting)
    Purple=back-up lights

    Use a continuity tester and see which terminal (on the trailer plug) corresponds with each wire in your "box". Standard trailer plug layout diagrams can be found at etrailer.com