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Author Topic: 4-pin to 7-pin trailer wiring adapter Problem  (Read 1993 times)

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Offline jaxbuckeye

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4-pin to 7-pin trailer wiring adapter Problem
« on: November 30, 2012, 12:12:00 PM »
My new (to me) Viking PUP trailer has a 7-pin "round" electrical connection including electric brakes.  Here's the adapter I have:  http://www.etrailer.com/Wiring/Tow-Ready/30717.html  When the 4-pin side of the adapter is plugged to my 4-pin harness on my vehicle, the 7-pin side of the adapter works.  The trailer lights work as well, however when I plug the 7-pin trailer harness into the 7-pin adapter the trailer lights don't work.  I hold the ground wire to my hitch.  Has anyone had a similar issue?

Offline tombiasi

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #1 on: November 30, 2012, 01:03:50 PM »
I'm not quite sure what your problem is. You connect your 4 pin to your vehicle and then connect the trailer to the adaptor and everything works.
What else do you need?

Tom
1998 Viking 1906 ST
2009 Trailblazer 4.2L L6

Offline CamL48

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #2 on: November 30, 2012, 02:34:16 PM »
The 4-pin on your vehicle will only supply the power/signals that control lights:  running lights, turn signals, brake lights, and back-up lights.  A 7-pin has additional lines that carry electric brake signals, power to charge batteries, and another aux line for some other trailer options and features (anti-reverse, e.g.).

The pig-tail adapter you linked to has provisions to run manual lines to connect for the additional 3 lines that your vehicle's 4-pin connector doesn't have.  E.g., there's a line that you can run directly to your brake controller so that you can use your trailer's electric brakes.  Or, you can ignore those 3 additional line outs and simply use the 4-pin signals that control your trailer's lights.

This is the operative photo of your adapter:



Now, if what you're saying is that your vehicle's signals are being properly routed through the adapter but that same signal is not making it through your trailer's electrical system to its lights, then you have some sort of electrical short in your trailer's wiring (and has nothing to do with 4-pin/7-pin adapters).

Ideally, you could plug the trailer into another vehicle with a 7-pin factory harness.  This would be the best way ensure that it's the trailer at fault.  Alternatively, you could use a circuit tester (or even a simple voltmeter) to ensure that the pin-outs on the adapter are generating the proper signals.

Assuming that the vehicle is fine and the adapter is fine, you'll have some work to do chasing down what is most likely a grounding issue.  I hate, maybe more than anything else, trying to find the source of an electrical wiring problem.

Good luck.
2007 Fleetwood Utah
2006 Ford Explorer V8
"Every time you use an apostrophe to make a word plural, a puppy dies."

Offline tombiasi

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #3 on: November 30, 2012, 03:08:56 PM »
He needs to properly ground the TV side and make sure that ground is wired to the trailer.(Please don't rely on a ball hitch ground [:O]
1998 Viking 1906 ST
2009 Trailblazer 4.2L L6

Offline ChocoChock01

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4-pin to 7-pin trailer wiring adapter Problem
« Reply #4 on: November 30, 2012, 06:17:04 PM »
I love how they standardized on WHT Grd!

Offline BroRobin

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #5 on: November 30, 2012, 08:45:25 PM »
When we bought our used NTU 1995 Starcraft, the camper's light harness had a four pin connector like a boat/utility trailer harness.  The PO had a 4 Pin to 7 Pin adapter that she gave me.  I plugged it into my 2004 Dodge Ram(I've only owned the truck since March '12) factory installed 7 pin receiver and none of the lights worked.  I then looked under the bumper and saw there was a standard 4 pin connector wired in (aftermarket I'm sure) so I plugged it in there and the lights worked. :) I've not had the time to trace down the issue yet.  [RTM]
I'm not sure but I don't think the PUP has brakes, but I think I would like to correctly wire the harness to a 7 pin connector even with no brakes/controller needed, I would like to have a 12 volt source in the connector to power the existing porch light by the door and the street side porch light that I bought from eTrailer and will install soon. That way I can have lights while still "hooked up" to my TV for after dark setup.  But I will need to make sure my TV 7 pin connector is functioning properly. (I hate to have to lay on my back and look up to work on the wiring on the TV, actually an inner ear problem is not conducive for working like this, I actually get dizzy and swimmy headed). [:(O]   

Offline poohsta3

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #6 on: March 26, 2013, 04:40:27 PM »
I have the same adapter just picked it up so that I can take the popup home with lights-DO i still need to attach that ground even if I dont need the brakes etc ?????
"Don't die wondering....."

Offline tombiasi

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #7 on: March 26, 2013, 04:55:09 PM »
I have the same adapter just picked it up so that I can take the popup home with lights-DO i still need to attach that ground even if I dont need the brakes etc ?????

Doesn't that adaptor specify to ground the white wire?
1998 Viking 1906 ST
2009 Trailblazer 4.2L L6

Offline PNW Family

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #8 on: March 26, 2013, 05:14:23 PM »
Yes, you MUST ground the large white wire, because on those adapters, the small white wire coming from the adapter side of the 4-flat connector are not grounded or connected to anything.  If you do *not* ground that large white wire, you will have an open ground, and the circuit will not be completed.  Nothing will work.
[TV] 2007 Hyundai Entourage SE
[PU] 1993 Coleman Arcadia

Offline poohsta3

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #9 on: March 26, 2013, 05:19:54 PM »
ahhh I see!~ I had assumed that white wire on the 4 side of the adapter was the ground. Ok makes sense now! thanks! ( sooo glad I found this site )  [8D]
"Don't die wondering....."

Offline goblinn2

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Re: 4-pin to 7-pin trailer wiring adapter Problem
« Reply #10 on: March 30, 2013, 05:07:41 PM »
when you are attaching the hot(black) wire up, disconnect your battery.  Nothing nay happen, but better safe than real electrical problems. 
When the Tikis are lit, so are we.

Goblinn2 & Whtail11

 


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