Looking for Wire Colors for Pins of etrailer Junction Box # e99011

Updated 05/26/2026 | Published 05/19/2026

Question:

I’m re-wiring a 1966 Airstream, I bought this junction box. My truck is a 1994 GMC that I just went from 4pin to 7pin. Is there an image of colors so I can ensure I’m making the right connects without slicing the casing to see the color to pin circle order? I’ve read that others had same complications with wrong wiring set up.

asked by: Megan

Expert Reply:

Hey Megan, I attached a picture that shows what the standard wire colors look like when attached to the pins of the junction box of part # e99011. I hope that is what you are looking for but if not all that really matters is that you match the pins of the junction box by function to the wiring of your trailer.

expert reply by: Jameson C

Junction Box Color Wires
(click to enlarge)

Megan

5/22/2026

I don’t see a picture. What I’m looking for is not the junction box colors, obviously I can see those with my eyes. I’m wondering how the colors lay in order around the circle that plugs into the truck. Blue, white… etc in clockwise order

Paul

5/22/2026

@Megan Simple google search will provide your eyes all they need to see. 7 pin wiring configuration.

Megan

5/23/2026

@Paul you don’t say! I was clarifying if it was SAE or traditional, as there are several mixed opinions in the reviews… and I’m working with a 1966 trailer, which when I first plugged in the lights weren’t lighting up correctly. There were flip flopped results. So yes, I’m asking for clarification