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I have a standard 4 flat trailer plug on my truck but my trailer plug is also a 4 flat plug but has two brown wires going to one prong. how do i hook them together to make all my lights on trailer work

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  • 358 Answers

The 4-wire flat plugs usually have a white (ground), green (right brake/turn) yellow (left brake/turn) and brown (taillights - left and right). If your brake and turn lights work but the taillights don't, check the plugs (trailer and truck sides) for corrosion, and chek both the trailer and truck wiring harnesses for chafed insulation and bare conductors on the brown wires. Likewiae if the taillights work and the brake/turn lights don't, perform the same checks on those wires. And last but not least, be sure that the white wires (truck and trailer) are grounded well to the truck body and trailer frame.

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: trailer light problem

Check it with a test light. White-ground, Yellow-left turn, Green-right turn, Brown-tailights. Check it on the truck first. There are seperate fuses for just the trailer wiring in the fuse box under the hood. The Blue and Red wires are for Trailer brakes, don't worry about those.

Posted on Mar 14, 2009

bad_dog1
  • 104 Answers

SOURCE: Towing light problem on wiring them up.

It looks like there could be a service bulletin to fix this.

TO: ALL TOYOTA DEALER PRINCIPALS,
SERVICE MANAGERS, PARTS MANAGERS
SUBJECT: SPECIAL SERVICE CAMPAIGN 10H
(2000 TUNDRA AND 1999 - 2000 TACOMA TRAILER TOWING WIRE HARNESS
CONVERTER REPLACEMENT)
Toyota will initiate a Special Service Campaign to replace the Toyota Trailer Towing Wire Harness
Converter (converter) on certain 2000 model year Tundra and 1999 - 2000 model year Tacoma
vehicles equipped with a genuine Toyota Trailer Towing Hitch or Bumper Hitch. This accessory
is included in the Towing Hitch Kit installed at ports (PIO) and by dealers (***); it is also sold by
dealers as an over-the-counter or service part.
An electrical short or open circuit can cause a fault in the genuine Toyota Trailer Towing Wire Harness
Converter (converter). This can cause a failure of the converter, and if a trailer is being towed at the time,
non-operation of the trailer lights. In limited cases, the converter housing could become heat-deformed.
In the case of the Tundra, the circuitry utilized in the converter was inadequate to properly manage
vehicle and/or trailer-side voltage spikes. If the converter is exposed to a voltage spike it may cause an
electrical short or open circuit within the converter.
As for the Tacoma, due to deficient waterproofing and improper installation location of the converter,
which is mounted in the lower portion of the taillight cavity of the vehicle, an electrical short circuit will
occur if water enters the converter housing.
The following vital information is provided to inform you and your staff of the campaign notification
schedule and your degree of involvement.
1. Owner Notification Letter Mailing Date
The owner notification will be conducted in two phases:
• The first phase will be launched in late August and involve vehicles equipped with port
installed (PIO) genuine Toyota Towing Hitch Kits.
• The remaining vehicle owners, whose vehicles may be equipped with a dealer installed (***)
genuine Toyota Trailer Towing Wire Harness Converter, will be notified in the second phase
to be launched in early September.
We have attached copies of the owner notification letters for your reference.
If you are contacted by an owner of an involved vehicle, who has not yet received a notification,
please verify eligibility through TDN or TIS, inspect the vehicle to assure it is equipped with the
affected part, and perform repairs as outlined in the attached Technical Instructions.

Posted on Jul 12, 2009

  • 142 Answers

SOURCE: hooking uo trailer lights

the back plug in on the truck most of the times on gm trucks has the wiring diagram printed on them

brown=running light
yellow=lt turn
green=rt turn
white=ground

your auto parts store also has a quick t plug that gives you a plug and play option/ or there is also a 7flat to 4 prong converter both are under $20

Posted on Sep 23, 2009

  • 121 Answers

SOURCE: Have 4 prong trailer plug with 5 wires how to hook

all colors will hook up the same, however that last wire probably blue, will not go to anything, that is for trailer brakes, if your vehicle isn't equiped with a controller then dont' worry about it, other wise you can always buy adapters from just about anywhere even home depot or walmart

Posted on Jun 25, 2010

  • 68 Answers

SOURCE: Wiring 4 way flat trailer plug. brown wire running

you got brown for running parking light
green for right turn/stop
yellow for left turn/stop
white for ground
reverse lights are only wired on a 6 or 7 plug connector
make sure you on the dark green for right turn stop not the light green
the light green is for reverse

Posted on Jul 13, 2010

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1 Answer

Found aunused plugin going into trunk could this be for the trailer lighting


It could be for a trailer. If it is for a trailer it will usually be a 4 prong black plug with a white,yellow.green and brown wires. Some manufactures will have plugs installed in wiring harness that are not used and are for different options on different vehicles

Apr 12, 2015 | Cars & Trucks

Tip

Trailer Wiring Standards (Color Codes/Plug Marks)


Hello all,

For those of you that have or occasionally borrow trailers and look at the wiring plugs with disdain (I mean face it they don't make sense, grd is white, +12vdc is black, etc), this is for you.

Plug Types/Application
7 Way - RV Trailers, Horse and Utility Trailers
6 Way - Horse, Stock and Utility
4 Way - Utility Trailers

Columns are Color, Function, Mark on the plug.

Seven wire Trailer plugs
:

Horse, stock or utility trailers:
White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7


Six wire trailer plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Recreational Vehicle: (color, use, plug mark)
White = Ground - GD
Yellow = Not used -
Brown = Right turn Brake - RT
Green = Tail and clearance lights -TM
Black = Battery, aux power - A
Red = Left turn/Brake - LT
Blue = Electric Brakes - S


Four wire plugs:
White = Ground
Yellow = Left turn/Brake
Green = Right turn Brake
Brown = Tail and clearance lights


Ground should be 10ga.
Others 14 ga

Best regards
Mike

on Sep 09, 2009 | 1981 Ford F 150

1 Answer

I ahve trailer lights with a red and black wire,which one goes where this is a 4 prong


normally red is positive and black is neg,, but heres how a 4 prong should be hooked up correctly http://www.accessconnect.com/trailer_wiring_diagram.htm notice that the wires on a 4 prong going to the trailer are Green , Yellow, Brown and White,,

Sep 24, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Hi, I just bought a brand new trailer that I had to put together myself. Now that is done. I wired it just like the book said and I converted from a 7 prong socket to a 4 flat but it is not working. I...


The brown wire should be for the running(tail/side marker) lights green is right turn signal(passenger side), yellow is left turn signal(driver side), and white is ground.

Feb 18, 2011 | Ford Expedition Cars & Trucks

1 Answer

Wiring 4 way flat trailer plug. brown wire running


you got brown for running parking light
green for right turn/stop
yellow for left turn/stop
white for ground
reverse lights are only wired on a 6 or 7 plug connector
make sure you on the dark green for right turn stop not the light green
the light green is for reverse

Jun 24, 2010 | 1999 Chevrolet Tahoe

2 Answers

Have 4 prong trailer plug with 5 wires how to hook up extra wire


The 4 prong plug will have 5 wires attached to it.
The white wire is the ground and is attached to the trailer frame near the front. There will be two brown wires and one goes down each side of the trailer. These wires will have a connection at the side marker lights near the front of the fenders. They will then continue to the tail lights. The light bar in the center is also connected to the brown wire.
The yellow wire at the plug is for the left stoplight and the green is for the right stoplight. One of the wires out of the taillights will be brown and the other wire will not match the color of the harness wire.

Jun 25, 2010 | Cars & Trucks

1 Answer

Hooking uo trailer lights


the back plug in on the truck most of the times on gm trucks has the wiring diagram printed on them

brown=running light
yellow=lt turn
green=rt turn
white=ground

your auto parts store also has a quick t plug that gives you a plug and play option/ or there is also a 7flat to 4 prong converter both are under $20

Sep 23, 2009 | 2008 Chevrolet Silverado 1500 2WD

1 Answer

Trailer lights


7 pin standard codes: Blue Brakes, Black 12v power, white ground, red right turn, brown left turn, green marking lights, yellow accessory power. 4 pin standard codes: White ground, brown marking lights, yellow left turn, green right turn. These will only work if both were wired to the standard code.

Jul 11, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

Looking for a wiring diagram for a 2006 Ford Expedition


7way- black is 12volt (power), brown, running lights, yellow is left turn signal and stop light, green is right turn signal and stop light, white is ground, blue is brakes, and orange is aux power (can be back up lights, if trailer equipped w/ them). 6way is the same, minus orange wire. I have run into some variations to the above color codes (brown, yellow and green only-sometimes these 3 are different than stated, but only mixed as that group, as to what they control- example would be green is running lights, brown and yellow are turn signal and stop lights, the others should be as stated), if you have any trouble with things not working properly, it may be due to these variations, although the above are pretty standard. If you have an ohm meter you can check as you go (check for power at black wire- should be constant 12v, turn on turn signal and check for power-it will fluctuate from approx. 12 volts to 0 volts as the signal power pulses in the wire) hit the brakes, blue wire should show power, etc. Let me know if you need more help as you go.

Apr 11, 2009 | 2006 Ford Expedition

1 Answer

Trailer light problem


Check it with a test light. White-ground, Yellow-left turn, Green-right turn, Brown-tailights. Check it on the truck first. There are seperate fuses for just the trailer wiring in the fuse box under the hood. The Blue and Red wires are for Trailer brakes, don't worry about those.

Mar 14, 2009 | 2005 Chevrolet Silverado 1500 2WD

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