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Old 08-13-2016, 11:48 PM   #1
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Yellow wire/7 way cord

Hi all have a question regarding the yellow wire in a 7-way cord. When pulling away from the 5th wheel felt a tug and found the 7-way had hooked on the 5th wheel hitch.
Well after putting everything back together and figuring out what wire went where I had one wire left over. From what I can find this yellow wire is supposed to be an auxiliary power wire, however it only gets power from my reverse lights and it was hooked to something as the insulation around the end of it has heated up (thankfully no blown fuses) and the trailer has no reverse lights. The wire has been capped off for now.
Any suggestions would be greatly appreciated.

Thanks,
Curt
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Old 08-14-2016, 04:04 PM   #2
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The center pin is usually dedicated for reverse lights or camera power. If you have neither of those on the RV then it shouldn't be connected to anything on the RV.

You can check the resistance of the yellow wire on the RV to make sure it isn't shorted and if it's powering something. If it's powering something you can apply power to it and see what turns on.
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Old 08-14-2016, 04:09 PM   #3
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Here you go!

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Old 08-14-2016, 10:30 PM   #4
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Bama and Herk, Thank you for the reply but I'm even more confused. With luck below you should see a picture of what I at the time was running off of.

The trailer itself only has 3 wires that are color coded properly white, black and blue. All the rest are a brown color and I had to probe and use jumpers to figure out what went were and what powers what. Everting thing is working properly signals, brake lights, ect.

The yellow wire coming out of the 7-way and going to the trailer only has power when TV is put in reverse. I'm guessing the reverse lights are powering this. Also the yellow wire was hooked to something on the trailer as the insulation at the end of the wire shows signs of over heating.

Both the trailer and TV are wired from the factories no type of modifications have been done that I'm aware of.
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Old 08-15-2016, 12:07 AM   #5
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Yellow is for reverse lights. It's the center pin on the plug. I'm not sure what your confusion is. If you don't have or want any backup lights then don't use it.
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Old 08-15-2016, 12:37 AM   #6
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Curt:

Herks drawing shows the wiring colors in the umbilical cord you plug into your tow vehicle.

If you open up the junction box that the umbilical cord is routed to, I believe you will find that the colors will change to the ones in your pic.

In other words, the Tow Vehicle/Plug colors are not the same as the actual wiring in your TT from the junction box to all the lights, etc.

I ran a standard 4-pin connector from my rear bumper to the junction box to power the LED's on my bike rack. The TT lights' wire colors were not the same as the umbilical cords wire colors. I wrote them down, but they're in the TT in storage at the moment, so I can't tell what they are.

I've attached a pic of the 4-pin wires, not that it helps much.
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Old 08-15-2016, 04:42 AM   #7
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Quote:
Originally Posted by 05CrewDually View Post
Yellow is for reverse lights. It's the center pin on the plug. I'm not sure what your confusion is. If you don't have or want any backup lights then don't use it.
First off .NO ONE IS REALLY WRONG... there are several different 7 pin trailer wiring configurations where the "yellow" wire is designated for different things.

The 7-wire traditional - the yellow wire is the "left turn/stop" lights
The 7-wire standard - the yellow wire is the "reverse" lights
The 7-wire heavy duty - the yellow wire is the "left turn/hazard" lights

Then of course there is the "DONT HAVE A CLUE" were some do it your self fool didn't take the time to follow a wiring diagram and only the lord really knows what color is for what.

https://www.etrailer.com/faq-wiring.aspx

Every Rv'er should have one of these simple 12 volt testers in their tool bag.
connect the lead wire to ground, touch the probe on the hot wire, if its hot the light glows.
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Old 08-15-2016, 05:28 AM   #8
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Quote:
Originally Posted by Curt and Michele View Post
Bama and Herk, Thank you for the reply but I'm even more confused. With luck below you should see a picture of what I at the time was running off of.

The trailer itself only has 3 wires that are color coded properly white, black and blue. All the rest are a brown color and I had to probe and use jumpers to figure out what went were and what powers what. Everting thing is working properly signals, brake lights, ect.

The yellow wire coming out of the 7-way and going to the trailer only has power when TV is put in reverse. I'm guessing the reverse lights are powering this. Also the yellow wire was hooked to something on the trailer as the insulation at the end of the wire shows signs of over heating.

Both the trailer and TV are wired from the factories no type of modifications have been done that I'm aware of.
I just changed plugs and left the yellow wire off the center terminal, I don't have reverse lights. All works fine. Either call etrailer or hopkins they will help you out. If you hook the yellow wire up your reverse tail lights on the truck will come on when you turn on your left signal light. Your TV reverse lights will blink at the same time. Just put a hopkins replacement on last week, Your TT might be different, they never wire two the same. They call it a 7 pin connector but you only use 6 wires. NOT THE CENTER TERMINAL...
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Old 08-15-2016, 07:50 AM   #9
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Quote:
Originally Posted by ShermanD View Post
First off .NO ONE IS REALLY WRONG... there are several different 7 pin trailer wiring configurations where the "yellow" wire is designated for different things.

The 7-wire traditional - the yellow wire is the "left turn/stop" lights
The 7-wire standard - the yellow wire is the "reverse" lights
The 7-wire heavy duty - the yellow wire is the "left turn/hazard" lights

Then of course there is the "DONT HAVE A CLUE" were some do it your self fool didn't take the time to follow a wiring diagram and only the lord really knows what color is for what.

https://www.etrailer.com/faq-wiring.aspx

Every Rv'er should have one of these simple 12 volt testers in their tool bag.
connect the lead wire to ground, touch the probe on the hot wire, if its hot the light glows.
I don't know why you're quoting me. I'm not saying anyone's right or wrong. I gave the best logical answer to there problem, which was further explained in their post #4.
All the other variables in trailer plug wiring info is TMI and I can see now how they can get confused.
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Old 08-15-2016, 07:54 AM   #10
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If the center pin is connected to something and you don't have reverse lights or a backup camera, then we can't tell you what it may be hooked to. And there is a possibility that it isn't hooked to anything, but got temporarily shorted and that's what caused the insulation to melt.

You should be able to open up the junction box under the RV and see if the yellow wire is actually hooked to anything.
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