Trailer Plug Wire Colors

[jb238smw]

I've got to replace the 7-pin plug on my 2007 Outback (corroded beyond hope, loose, etc.). It's a molded plug, so I don't know how I can open it up to get the right color wire to the right connector on the new plug. Any ideas here?
I saw in a thread about a year ago a diagram of a plug with the pin numbers, function and a color-coding. According to this diagram:
Pin 1 - Ground - White
Pin 2 - Brakes - Blue
Pin 3 - Tail/Running Lights - Brown
Pin 4 - Aux 12V/Charging - Red
Pin 5 - Left Turn/Stop Light - Yellow
Pin 6 - Right Turn/Stop Light - Dark Green
Pin 7 - Backup Lights - Light Green (my trailer doesn't have these)
If this configuration is valid for my trailer, then I should be able to just cut off the old plug and attach the correctly-colored wire to the the appropriate terminal on the new plug.
Anyone have a better idea, or see anything wrong with my logic?
Thanks

[chuckster57]

Here’s a link that will make it easy:

https://www.etrailer.com/question-363.html

Disconnect the battery cable positive before you start cutting anything.

[flybouy]

Check to ensure you have enough extra cable first. You will be shortening it by about 6" when you cut the end off. If it's corroded make sure you cut it back far enough to get nice, Shiney copper wire.

I don't know about your trailer but back then some trailers the cable into the camper was terminated in a 4" square electric box and was wire muted together. If that's the case then I'd buy the upgrade kit https://www.etrailer.com/Wiring/etrailer/e99011.html and have a nice molded plug and weather tight stud mount terminal box.

[Canonman]

Here's one

[NH_Bulldog]

I recently replaced my cord end as well (but mine was operator error by forgetting to unplug before I pulled away in the truck). I don’t trust any “standard” wiring convention, so I cut the end off and used an ohm meter to check each wire one at a time as I screwed them into the new plug end. Checked operation of all the lights, turn signals, brakes, etc. and got it right.

[Wxman]

Just to add to the confusion if there is any. The posted wiring diagrams and colors don't match what is on my RV. The one listed at this link https://friessandsummit.com/Wiring.php
matches what is on my RV. (Note the yellow wire is reverse lights and not used and there is no purple.)
Seems there was a different color convention between the horse/utility people and the RV people. The pins match and are interchangeable but the colors aren't consistent. Bulldog's suggestion may be the best bet.
This link may help as well. https://www.etrailer.com/faq-wiring-7-way.aspx

Good luck

[ChuckS]

Since yours is a 2018 Keystone this PDF is the standard wire color code from 2015 forward....

https://www.keystonerv.com/media/914...eystone-rv.pdf

[Wxman]

Good info. PDF saved.

[jb238smw]

Hey Bulldog - I like your idea, but electrician I am not. How did you use the ohm meter to check continuity?
For all the others - the plug diagram Canonman sent matches the one I had seen earlier, so think I'm good to go. Thanks to all for the help.

[NH_Bulldog]

Originally Posted by jb238smw

Hey Bulldog - I like your idea, but electrician I am not. How did you use the ohm meter to check continuity?
For all the others - the plug diagram Canonman sent matches the one I had seen earlier, so think I'm good to go. Thanks to all for the help.

When I cut the old end off, I left an inch or so of the cord sticking out then stripped the outer sheathing and separated the individual conductors. Looking at the plug face with the raised ridge at 12 o’clock, I set my meter to ohms (mine beeps when it makes a connection) and poked one probe of the meter into the blades at 1 o’clock and then touched each of the wires until the meter beeped. Take that same wire on the trailer and attach to the 1 o’clock position on the new plug. Repeat for the remaining 6 wires at 3, 5, 7, 9, and 11 o’clock and then the center pin just to double check.

Absent a meter, you could MacGyver a test light with a battery and an old 12v light bulb