7-pin wiring clarification needed

[1x1_Speed_Craig]

First of all, my vehicle is a 2005 Wrangler Unlimited with a factory Mopar hitch & 7-round plug. My trailer is a '93 M101A3 with the original military lights that I already swapped 12V bulbs into. I checked the service manual for the M101A3, and determined which wires routed to which function.

I got a Phoenix USA junction box from Adventure Trailers, already set up with a 7-round pigtail. All terminals are marked with color & function, and the color-coding lines up directly with the bottom image below ("SAE coding convention for 7-pole connectors", which I found in this "Wiring 101" thread). However, it took a while testing things, as nothing seemed to be working right when first hooked up. What I eventually found is that the color-coding on the pigtail coming off the vehicle matches up to the "7 pole" (top) image below, not what's indicated in the junction box.

So, it seems as though I have it figured out functionally, but I want to understand why the wiring colors differ from what's indicated in the Phoenix USA junction box. Can someone please explain this to me - clearly, a non-electrician :sombrero: ?


Thanks,
Craig

 

[Martyn]

Unfortunately the wiring diagram you have is not typical, it's and add on to the 4 way plug wiring. More typical for 7 way wiring is:
White - Ground
Blue - Electric Brakes
Green - Running lights
Black - 12 volt
Red - Left Stop & Turn
Brown - Right Stop & Turn
Yellow - Auxiliary or back up

 

[1x1_Speed_Craig]

Unfortunately the wiring diagram you have is not typical, it's and add on to the 4 way plug wiring. More typical for 7 way wiring is:
White - Ground
Blue - Electric Brakes
Green - Running lights
Black - 12 volt
Red - Left Stop & Turn
Brown - Right Stop & Turn
Yellow - Auxiliary or back up

Thanks Martyn. Your "mapping" DOES match up to the top portion of the image above, though. I just found it odd that the junction box lined up differently. I'll rearrange the wires/terminals in the box according to your notes.

Craig

 

[1x1_Speed_Craig]

I'm not getting any current off the yellow (accessory) wire (I am, however, getting steady power on the black, as expected). What controls the flow on the accessory wire?

Craig

 

[njtaco]

Check if it is for backup lamps...

 

[Martyn]

I'm not getting any current off the yellow (accessory) wire (I am, however, getting steady power on the black, as expected). What controls the flow on the accessory wire?

Craig

You need to wire it up to your back up lights, if that's what you want to power off it.

 

[1x1_Speed_Craig]

Check if it is for backup lamps...

You need to wire it up to your back up lights, if that's what you want to power off it.

Thanks, gentlemen. I'll check to see if I get current when I put the Jeep in reverse. I hadn't tried that yet.

And yes, I'd love to install back-up lights if the wiring makes it that simple.


Thanks,
Craig

 

[1x1_Speed_Craig]

Woot! Yellow is definitely the back-up lights. Shopping for some LEDs now... :victory:

 

[Martyn]

Woot! Yellow is definitely the back-up lights. Shopping for some LEDs now... :victory:

Got those in stock right now, some surface mount units with 18 white LED # 7.8" L x 3.3" W x 0.8"H (20.32mm x 196.85mm x 82.55mm) $33.99