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09-24-2020, 02:00 PM
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#1
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Junior Member
Join Date: Sep 2017
Location: Sautee-Nacoochee
Posts: 18
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Trailer Plug Wire Colors
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
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09-24-2020, 04:08 PM
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#2
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,353
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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.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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09-24-2020, 04:28 PM
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#3
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,758
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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.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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09-24-2020, 04:33 PM
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#4
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Senior Member
Join Date: May 2016
Location: South Jordan, Utah
Posts: 2,228
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Here's one
__________________
2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
I think the little voices in my head have started a chat group.
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09-25-2020, 03:46 AM
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#5
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Senior Member
Join Date: Apr 2019
Location: Henniker
Posts: 2,176
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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.
__________________
Rob & Amy
2019 Passport 240BH SL (for sale)
2024 Cougar 29BHL (Taking delivery 5/11/24)
2022 Ford F250 7.3L Godzilla Crew Cab FX4
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09-25-2020, 04:47 AM
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#6
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Senior Member
Join Date: Sep 2017
Location: West Central IN
Posts: 141
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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
__________________
Wxman
2018 Passport Elite 19RB (sold)
2021 Jayco Eagle HT 274CKDS
2017 Silverado Z71 5.3L 3.42 gears(sold)
2021 Sierra 2500 4x4 CCSB SLT (gas)
E4 16k/1.6k hitch
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09-25-2020, 05:04 AM
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#7
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,015
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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
__________________
2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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09-25-2020, 05:13 AM
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#8
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Senior Member
Join Date: Sep 2017
Location: West Central IN
Posts: 141
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Good info. PDF saved.
__________________
Wxman
2018 Passport Elite 19RB (sold)
2021 Jayco Eagle HT 274CKDS
2017 Silverado Z71 5.3L 3.42 gears(sold)
2021 Sierra 2500 4x4 CCSB SLT (gas)
E4 16k/1.6k hitch
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09-25-2020, 09:10 AM
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#9
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Junior Member
Join Date: Sep 2017
Location: Sautee-Nacoochee
Posts: 18
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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.
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09-25-2020, 12:17 PM
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#10
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Senior Member
Join Date: Apr 2019
Location: Henniker
Posts: 2,176
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Quote:
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.
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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
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