1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Trailer Light Problem

Discussion in '1st Gen. Tacomas (1995-2004)' started by andrew90, Apr 14, 2015.

  1. Apr 14, 2015 at 8:18 PM
    #1
    andrew90

    andrew90 [OP] Member

    Joined:
    Apr 14, 2015
    Member:
    #153205
    Messages:
    23
    Gender:
    Male
    Jamestown, TN
    Vehicle:
    04 Tacoma SR5
    3" lift kit, 4.10 gears, 33" Nitto Trail Grappler Tires
    I'm having problems with my 4-pin wiring for trailers. My left turn signal and is working but nothing else. No running lights brake lights or right turn signal. I seem to have a good ground and solid connections(continuity) to the converter box in the back of the cab. Anyone have some insight on this? If I get a manual does it show wiring for the trailer system? I also can't seem to find any fuses relating to the trailer wiring.

    I have a 2004 Tacoma SR5 Double Cab.
     
  2. Apr 15, 2015 at 9:56 AM
    #2
    nzbrock

    nzbrock Well-Known Member

    Joined:
    Jan 6, 2013
    Member:
    #94572
    Messages:
    1,798
    Gender:
    Male
    First Name:
    Noah
    Philadelphia, PA
    Vehicle:
    99 TRD Prerunner 3RZ
    SAW 2.0 Coilovers Wheeler's 5 Leaf Bilstein 5100s LCE long tube header Flowmaster Delta 50 Muffler FJ Trail Team Wheels 255/85/16 Cooper ST Maxx 4Runner overhead sunglass console RSX Leather Seats All LED lights Red/Clear Tail Light Tundra Brakes Black Headlights and Corners 4Runner Auto Up/Down Windows Bullet Liner Cargo tie down system
    Where did you get your trailer wiring? Tacomas (correct me if I'm wrong) have a separate bulb for the turn signal and brake light. Trailers (wired with 4-pin) share a bulb for the turn and brake. Therefore you need a converter. http://www.amazon.com/Hopkins-43315-Plug-In-Simple-1995-2004/dp/B0002Q7ZKK
    If this is what you have then please ignore this part.

    Do you have any LED lights installed in your turn, brake, or running lights? These are not compatible with most trailer converters. I put an LED specific one on my truck once I converted everything to LED. I cannot remember which on it was off the top of my head but I will see if I can find it.
     
  3. Apr 15, 2015 at 3:58 PM
    #3
    keakar

    keakar Well-Known Member

    Joined:
    Oct 2, 2014
    Member:
    #139537
    Messages:
    5,262
    Gender:
    Male
    First Name:
    karl
    louisiana
    Vehicle:
    2006 4runner sport 4.7L V8 (white)
    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
  4. Apr 17, 2015 at 9:28 PM
    #4
    andrew90

    andrew90 [OP] Member

    Joined:
    Apr 14, 2015
    Member:
    #153205
    Messages:
    23
    Gender:
    Male
    Jamestown, TN
    Vehicle:
    04 Tacoma SR5
    3" lift kit, 4.10 gears, 33" Nitto Trail Grappler Tires
    Thanks for the info. Sounds like this will be a good long term fix.
     
  5. Apr 17, 2015 at 9:33 PM
    #5
    andrew90

    andrew90 [OP] Member

    Joined:
    Apr 14, 2015
    Member:
    #153205
    Messages:
    23
    Gender:
    Male
    Jamestown, TN
    Vehicle:
    04 Tacoma SR5
    3" lift kit, 4.10 gears, 33" Nitto Trail Grappler Tires
    Another question. Where is the module your referring to? From the diagram it looks as if you just splice and solder the diodes in directly behind the connector.
     
  6. Apr 19, 2015 at 12:07 PM
    #6
    keakar

    keakar Well-Known Member

    Joined:
    Oct 2, 2014
    Member:
    #139537
    Messages:
    5,262
    Gender:
    Male
    First Name:
    karl
    louisiana
    Vehicle:
    2006 4runner sport 4.7L V8 (white)
    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
    the module is something you buy to convert the Tacoma wiring to work the way trailer wiring works.

    see it here: http://www.ebay.com/itm/TRAILER-HIT...ESS-/141633556843?hash=item20fa04916b&vxp=mtr

    that black box between the trailer plug and the truck tail light plugs is the converter module

    what I did was to just remove and replace the module with the diodes

    the module is made with diodes and a transistor inside it and the transistor is what always goes bad on them. the transistor is useless and serves no purpose at all but its used like a fusible link instead. you already have fuse protection for your wiring so this transistor is just a weak point that makes the unit fail over time so you need to buy another one. it truly is built with parts designed to fail after a certain period of time so you buy another one. diodes never fail and last forever so if they built these with just diodes and no transistors in them then they would only be able to sell you one in your lifetime.
     
    Last edited: Apr 19, 2015

Products Discussed in

To Top