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  1. #1
    Pettee's Avatar
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    Need some wiring help

    Ok I bought a new wiring harness for my trailer. Wired it up and everything but the tail lights worked. Traced it back to needing a new adapter for the 7 to 4 pin adapter.


    Replaced it... and now everything works... except for the tail lights.


    Any ideas? I had a friend of mine come take a look at it and everything seems ok. Grounds are fine, bulbs are fine. Flashers/Signals/Brake lights work. Just no tail lights.


    Im lost, and am about 2 days away from just going and getting a whole nother new wiring kit and starting over.


  2. #2
    Moderator RX951's Avatar
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    Trailer Wiring Diagram

    I have another pics, lemme see if I can find it....and I have a chart for troubleshooting too somewhere



  3. #3
    Moderator RX951's Avatar
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    Two more links

    * http://www.marksrv.com/wiring.htm

    * http://www.accessconnect.com/trailer_wiring_diagram.htm

    NOTE: also check to see if you have a FUSE for the parking/running lamps !!



    7 Way RV Connector

    Pictured below is the Pollak 7 way connector, which is the connector style in most common use on RV trailers and is becoming increasingly popular on horse and utility trailers. This connector is also manufactured by the Theodore Bargman Company and there are also some generics around. They are supposed to be interchangeable and the wiring color code is maintained among the various brands.
    As you can see in the illustration below the back side of the connector body is labeled at each terminal. The labels are listed below with the function assigned to that pin.
    On the tow vehicle side with the exception of 96-98 Ford and Dodge pickups and SUV's with factory installed trailer wiring, wire color alone should not be relied on, always test and match the function to the appropriate terminal.
    On the trailer side RV's for the most part are wired to match the connector colors. Any plug that has been changed or extended, along with horse and utility trailers should be tested when replacing for any reason to be sure the function matches the terminal.
    It should be noted below that the center terminal is labeled as an auxiliary circuit, most commonly used for backup lights not a ground terminal as many try to make it.
    Also after the connector diagrams find more information on wire colors used by GM, Ford, and Dodge.
    Wiring Code 7 way Car End#ColorGageCircuit Functionconnector interior1white10common ground2blue12electric brake3green14tail/running lights4black10battery charge (+)5red14left turn/stop6brown14right turn/stop7yellow14auxiliary/back upNOTE: #7 is the center terminal and currently is most commonly used for backup lights.
    Wiring Code 7 way Trailer End#ColorGageCircuit Functionconnector interior1white10common ground2blue12electric brake3green14tail/running lights4black10battery charge (+)5red14left turn/stop6brown14right turn/stop7yellow14auxiliary/back upNOTE: #7 is the center terminal and currently is most commonly used for backup lights. Click for 6 way connector wiring.

    This chart should be used as a general guide only, you should always test before connecting your wiring.
    This chart also may not be accurate for vehicles with factory installed trailer harnesses. In past 2-3 years manufacturers have begun to match the wire colors to the code for the common 7 way RV connector. More on that after the chart.
    Caution if your vehicle has a diagnostic indicator that tells you when a lamp is burned out or not functioning, you may need special wiring adapters and testers. Not using these adapters may cause damage to the vehicle wiring or computer.functionGMFordChryslerleft turn & brake lightsyellowlt green w/orange stripedk greenright turn & brake lightsdk greenorange w/blue stripebrowntail lightsbrownbrownblack or black w/yellow stripeback up lightslt greenblack w/pink stripevioletground
    see note 1blackblack or greyblack
    In addition to the above some cars and trucks have a separate light for the brake light, most commonly identified by amber turn lenses in the rear. Chrysler and Jeep may have the separate light and use red lenses. If you have this type of wiring a converter is required.brake lightlt blue or pinkred w/green stripewhite Note 1: We recommend attaching the trailer harness ground directly to the frame or a solidly attached sheet metal part, using a screw or bolt. The single most common cause of trailer lighting problems is a poor ground on the tow vehicle or trailer.
    The common flat 4 wire connector used on boat, snowmobile, and light utility trailers most commonly uses the following code.


    Flat 4 wiring codewhitegroundyellowleft turn/brake lightgreenright turn/brake lightbrowntail
    Factory installed wiring harnesses frequently match the flat 4 colors.
    Notes about GM OEM wiring harness. Most GM vehicles except '99 & 2000 Silverados match the following.

    GM trailer wiring codewhitegroundyellowleft/brakegreenright/brakebrowntaillight greenbackupbluetrailer brakesred *12 volt +* Pickups only: since approximately 1996 the 12 volt + wire is orange. The orange and blue wires are in a separate bundle taped to the wire harness that runs down the frame on the drivers side. A white wire may also be found in that bundle, it is a brake light wire which is not normally used for trailer wiring.
    !! WARNING !!
    When using vehicle manufacturer supplied brake control connector harness, DO NOT match colors, consult the charts below. We recommend that you also use a test light or voltmeter to confirm the listed wire function.
    Cheverolet/GMC brake control connector wiring harness
    color code for factory supplied harnessGM supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionredblack+12 voltlight blueredstoplightblackwhitegrounddark bluebluetrailer brakesbrownnot used NOTE: The above applies only to the GM factory supplied harness, if using Tekonsha harness #3025, the harness colors match the brake controlDodge tow vehicles with the Factory Tow Package Brake Connector

    Dodge vehicles with this package are equipped with a 15 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. For 3 & 4 axle (6 or 8 brake) applications a separate power wire should be installed directly from the battery positive to the brake control and should include an inline 30 amp auto reset circuit breaker. Dodge/Chrysler brake control connector wiring harness
    color code for factory supplied harnessDodge/Chrysler supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionred w/black tracerblack+12 voltwhite w/tan tracerredstoplightblackwhitegroundbluebluetrailer brakesNOTE: The above applies only to the Dodge/Chrysler factory supplied harness, if using Tekonsha harness #3020, the harness colors match the brake controlFord tow vehicles with the Factory Tow Package Brake Connector

    Ford vehicles with this package are equipped with a 20 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. For 3 & 4 axle (6 or 8 brake) applications a separate power wire should be installed directly from the battery positive to the brake control and should include an inline 30 amp auto reset circuit breaker. Ford brake control connector wiring harness
    color code for factory supplied harnessFord supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionpinkblack+12 voltredredstoplightwhitewhitegrounddark bluebluetrailer brakesbrownnot used NOTE: The above applies only to the Ford factory supplied harness, if using Tekonsha harness #3035, the harness colors match the brake control
    Nissan tow vehicles with the Factory Tow Package Brake Connector
    using a red/green stop light wireNissan supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionredblack+12 voltred/greenredstoplightblackwhitegroundbrown/whitebluetrailer brakesred/bluenot used NOTE: The above applies only to the Nissan factory supplied harness, Tekonsha does not supply a harness for this vehicle.
    Toyota tow vehicles with the Factory Tow Package Brake Connector
    using a green/white stop light wireToyota supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionblack/redblack+12 voltgreen/whiteredstoplightbrownwhitegroundredbluetrailer brakesgreennot used NOTE: The above applies only to the Toyota factory supplied harness, Tekonsha does not supply a harness for this vehicle.
    Toyota tow vehicles with the Factory Tow Package Brake Connector
    using a green/yellow stop light wireToyota supplied brake control harnessTekonsha brake control wires
    All electronic modelsfunctionblack/redblack+12 voltgreen/yellowredstoplightwhite/blackwhitegroundredbluetrailer brakesgreennot used NOTE: The above applies only to the Toyota factory supplied harness, Tekonsha does not supply a harness for this vehicle.
    800.713.3235
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    Last edited by RX951; 02-27-2007 at 03:53 PM.

  4. #4
    Moderator RX951's Avatar
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    7-WIRE Circuit



    4-WIRE circuit


  5. #5
    flyboy's Avatar
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    I had the same problem on my Jeep, everything worked but the "running lights" for some reason, I had to start the Jeep up for them to come on.

  6. #6
    Moderator RX951's Avatar
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    Troubleshooting Sites for Trailer wiring

    http://www.hitches4less.com/troubleshooting-trailer-wiring.html
    http://www.rofb.net/faq/faq_trailerwiring.htm
    http://haystackhill.com/Wiring.html


    I am sure there are a bunch of Jeep owners here to help. flyboy and Hydrotoys own jeeps.

  7. #7
    Pettee's Avatar
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    Quote Originally Posted by flyboy1300 View Post
    I had the same problem on my Jeep, everything worked but the "running lights" for some reason, I had to start the Jeep up for them to come on.
    If i get home, and that works, Im punching my cat.

  8. #8
    Pettee's Avatar
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    RX-Thanks for the Info man. I will take another look to see whats going on.

  9. #9
    Years ago I had an Jeep Cherokee...'88 I think..anyway..when I hooked up a little boat trailer...none of the lights worked. I replaced the entire harness as mine was old and in serious disrepair. After everything was hooked up nothing worked..still..I ground down a spot on the trailer for a gound point and got lights...but only faint. Turns out there is a $20 doodad the replaces a gizmo in the fuse box...swapped the old with the new...ta da...bright lights. That little doodad was about the diameterof a half dollar and maybe 3/4 of an inch thick...had a coupla prongs on one side...some kinda resister or some such. Maybe...who knows.

  10. #10
    I'm kind of a big deal SeanCucf's Avatar
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    got the simple plug in style from advanced/discount auto and have never had a problem with my Jeep....sorry, maybe you oughta try a new harness...wish ihad better info

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