How to wire a 7 Way Trailer Plug 

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That’s awesome! I’m glad the video helped you out! Thanks for checking it out.

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Thanks for watching! I'm glad to hear it was helpful for you! Wire coloring can be tricky between tow vehicles and trailers and between different makes and models of vehicles! Happy to hear you're up & running!

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Glad it helped! We just released a new video showing wiring 7 way plugs for RV with a reverse wire Thanks for watching!

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You can use dielectric grease if you prefer. I normally don't, but if you live somewhere that has a climate that leads to corrosion, such as close to the coast or in an area that uses salt mixtures on the roads in icy weather, then it would probably be a good idea to use it. Great question and thanks for watching!

“Aight then. Mmm hmmm”-Carl (Sling Blade) 😄 Thanks for watching!

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Man, thanks for the idea. I’ll have to do some checking on that. What make & model tractor do you have?

Hi! Thanks for watching! The center wire/pin is only used for a reverse wire. For the example in this video, we installed a 7 way RV plug wired with a 6 way trailer configuration. In boat trailers, sometimes the center pin is used to block hydraulic flow when reversing, operating off the reverse signal. The center pin is only ever used for reverse function. Hope this helps clear things up.

The flickering definitely sounds like a ground or a contact issue. With the trailer plugged in and your headlights on, start from your truck plug and work your way back, tug, shake, pull any accessible wires to see if you can create the flicker in hopes of isolating the bad ground and/or short. Where the 2 scotch type connectors are, remove those. There's a good chance you may have some corrosion where those connectors pierce the insulation of the wire. As far as the truck plug, not all factory plugs are accessible internally and have to be replaced if that is the issue. Hope this helps! Thanks for watching the channel!

Thanks for the detailed reply. Did everything you said above. Found nothing loose, and could not replicate the flickering. The one connector was a factory harness connection and was all tight. Will dive in to the trailer tail lights once it warms up a bit. One thing worth noting, when I left BassPro parking lot, (to have the trailer looked at), I hadn't even got out of the parking lot and they starting flickering, and when I exited off the interstate, going down the ramp, the lights tend to come on when I have that side force going on the truck and trailer. Do you think it might be in the truck receiver hitch? I can move the ball when not hooked up. I even had the lights hooked up to the truck, unhooked the trailer from the receiver ball hitch, but lights stayed on. It's something that doesn't take much movement. Thanks again for any info!!!!!!!!!!!!!!!!@@TheTrailerSmith

Are you asking for a 7 way molded plug? Do you have a part number for the connector? I'm happy to look at doing something for you.

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Thank you for your comment! In this video, we are focusing on utility trailers, which have a 6 wire set up. We will focus on RV wiring in future videos and that will feature 7 wires. A 7 way plug is universal and has been the standard for the utility & livestock trailer industry for many years now and works well for a 6 wire or 7 wire set up. Depending on wire manufacturer, some use blue and some use black to indicate the brake wire.

I have a utility trailer with 7 wire for my landscape business...open trailer...not an RV...

Good job. Very understandable.

The 7th wire, is the centre pole, which wasn't used here. As I mentioned above, it can be used for different things, one of the more popular usage is for 'backup lights' of which most trailers don't have, so it's not needed. I would think a short 'jumper' could be made, to set this up as needed, depending on what your usage is. I use this setup on my motorhome, of which I tow a car behind, so I suppose I 'could' have the cars reverse lights come on, but in reality they would never be used, so I use my Pollak plug as a 6 way plug.

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For this style of plug, we are still having good luck with Pollak. Unfortunately, many products we use today aren't what they once were. Thanks for watching the channel!