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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Problems with 7 Pin Connector

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Taffy.C

MN

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Posted: 02/20/21 03:51pm Link  |  Quote  |  Print  |  Notify Moderator

Hi There,

Having issues with the 7 Pin trailer connection between my trailer and TV. I can't seem to get all contacts connecting at once - I I jiggle the connection slightly I can get brakes connected but I lose one or more light connections and vice-versa.

I've tried using a very find grade wet/dry sandpaper to clean the contacts but that only brought minor improvements. I'm thinking that maybe the connections are too sloppy and maybe I need to replace the trailer connector plug. The trailer is 18 years old.

I'd welcome any suggestions on this - not sure how difficult it is to replace the connector too. Also, because I have a hensley hitch that added a few inches to the trailer length, I don't have any room to lose length on the electrical cable (which I figure might happen when I replace the connector plug). If anything I need to make it longer.

Any help much appreciated,

Daniel.


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jdc1

Rescue, Ca

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Posted: 02/20/21 04:07pm Link  |  Quote  |  Print  |  Notify Moderator

Sometimes I have to use a screwdriver to bend the prongs for better contact. I use lithium grease on my wife's plug-in Prius cord, and that really helps.

deltabravo

Spokane, WA

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Posted: 02/20/21 04:13pm Link  |  Quote  |  Print  |  Notify Moderator

Some plugs on trailer cords have an undersized diameter on the plug, so they fit really loose and sloppy in a truck OEM plug.

I had the same problem. I replaced the entire cord / molded plug with a different brand, problem solved.


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Lwiddis

Bishop area, California

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Posted: 02/20/21 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

I replaced my 7 pin connector and no problems since.


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MitchF150

Puyallup, WA

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Posted: 02/20/21 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

That happened to me a long time ago.. I took a small flat blade screw diver and pulled the 'female' side prongs out in each socket and then sprayed some wd40 into the plug and that fixed it.. It was only a plug connection issue in my case, but if it's a wiring issue, then more work will need to be done to diag it..

Good luck, Mitch


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Taffy.C

MN

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Posted: 02/20/21 06:02pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the replies. Pretty sure the wiring is fine so I guess I'll start with the screwdriver and WD40. Hopefully its that simple[emoticon]

rr2254545

Central Minnesota

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Posted: 02/20/21 06:32pm Link  |  Quote  |  Print  |  Notify Moderator

Had the same problem replaced the female plug on the RV, no problems since then - it was not the cord -


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Diamond c

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Posted: 02/20/21 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

If the prongs have a split in the middle of them take a small flat blade screw driver, put it in the split and spread them so that they fit tighter. This works for me on the pigtail of my tractor trailer.

Gdetrailer

PA

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Posted: 02/20/21 09:03pm Link  |  Quote  |  Print  |  Notify Moderator

You can try to clean them, scrub them, adjust the prongs but after a while weather and age takes a toll on the plugs..

For $6 and a little bit of your time you can just replace the plug and be done with the issue for quit some time..

[image]

FOUND HERE

For less than $30 you can buy not only the plug but the entire harness with the plug molded in to the harness with 8ft of wire..

[image]

FOUND HERE

That one looked interesting since it has double prong contacts in the plug rather than standard single prong contacts..

JRscooby

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Posted: 02/21/21 06:53am Link  |  Quote  |  Print  |  Notify Moderator

Diamond c wrote:

If the prongs have a split in the middle of them take a small flat blade screw driver, put it in the split and spread them so that they fit tighter. This works for me on the pigtail of my tractor trailer.


Commercial with round holes/pins is much easier.
I have used 2 pair of needle-nose pliers to bend a slight V in the length of the blade, then flatten the ends so the plug will start back on. Less work to replace the plug, and likely only last for 1 trip.

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