Who screwed up trailer wiring?

[Lost_in_the_HTTP]

Where else is white ground? And brown?

Common sense would say black Ground and red Stop. I can sort of see gReen Right and yeLlow Left, but why not the same as aircraft and marine with green right and red left?

 

[dullard]

I am in the middle of renovating a trailer myself. The trailer is older than I am and needed a lot of TLC. I have just gone through the same wire color mess that you are looking at.

Ultimately though it is low voltage DC. There are no color requirements for low voltage DC. None. If we were forced to follow low voltage color standards, then these ribbon cables would all be 100% custom made and would be an utter mess to deal with (what if you don't need the 3rd through 6th purple wire that is forced to a standard you don't use but you could use three more blue wires).



Or what about this, would it be forced to just carry 18 ground signals?

 

[lxskllr]

Haven't had to rewire one yet. Reminds though, I need to buy a marker for a busted light. What annoyed me was three different plug standards. You have the pro plug, the prosumer plug that replaced the n00b plug, and the n00b plug that I believe is deprecated, but still found. Dunno why they don't use the pro plug on everything. Doesn't cost much more, and you're ready for anything. Dongles are bullshit.

 

[BoomerD]

Colors on 7-Way Trailer Light Wiring Meaning | Trailer Parts Outlet

Let's learn what the colors on your 7-way trailer light wiring harness mean with this helpful guide from experts at The Trailer Parts Outlet.

thetrailerpartsoutlet.com

Two Types of Wiring to Know: SAE Standard or RV Standard​

The color coding on your harness is going to vary depending on whether you’ve got a trailer or an RV. Trailer wiring is designed in accord with the practices of the Society of Automotive Engineers, or SAE.

Color Coding for SAE Standard Trailer Light Wiring

• Green: Right turn/brake light
• Yellow: Left turn/brake light
• Brown: Tail/running lights
• White: Ground wire
• Blue: Brake controller output
• Black: Battery hot lead
• Purple: Reverse lights

Color Coding for RV Standard Lights Wiring

• Green: Tail/running lights
• Yellow: Reverse Lights
• Brown: Right turn/brake light
• White: Ground wire
• Blue: Brake cont
• roller output
• Black: Battery hot lead
• Red: Left turn/brake light

 

[sdifox]

Wiring standards are more guidelines. Always test your cabling.