Question about 2001 GMC Savana

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I need to connect a four-wire plug to the trailer wiring harness. The vehicle has four wires (right turn, left turn, park, and back-up) and the 4-pole flat has four wires (ground, right turn, left turn, and tail). The turn wires are easy, but what do I hook the ground and the tail up to. Also, how do I test to make sure they work without having a trailer??

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  • GMC Master
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I suggest check this diagram...

I need to connect a four-wire plug to the trailer - a473b57.jpg

Also can visit this link for additional details: etrailer.com/faq-wiring

Hope helps.

Posted on Sep 08, 2010

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1 Answer

Have no power for running lights at trailer plug


The T PARK fuse in the rear fuse-relay block supplies battery positive voltage to a separate park lamp circuit connected to the trailer wiring harness..
For trailer wiring, separate turn signal circuits are connected through the GMSF to the trailer wiring harness.
Fuse Block - Rear
Beneath the left rear seat
Trailer TR/PARK fuse 42 10amp

Apr 14, 2016 | 2007 GMC Envoy Denali

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, ground is white, +12vdc is black, etc), this is for you.

This will show you how to wire trailers with seven, six and four pin connectors

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 (Large trailers with a battery and electric brakes):

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 | 2004 Dodge Ram 2500

1 Answer

When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

mr_brokrench_4.jpg

Sep 18, 2011 | Honda Accord Cars & Trucks

2 Answers

2004 Chrys Concorde, new utility trailer, tail light converter. Problem: There is output from conv box in yellow wire, when turn signal is on, but when it is connected to the trailer harness, no output...


Your vehicle CANNOT be wired for a trailer without using the converter box. The only vehicles that do not require a converter box are the vehicles that use the stop lamp bulb as a turn signal. Your vehicle is equipped with SEPARATE stop lamp and turn signal bulbs.

To make the converter box work correctly, it must be wired according to the instructions to BOTH the stop lamps AND the turn lamps. The tail (or PARK) lamps DO NOT go through the converter box.
Your trailer uses the SAME bulb for stop and turn - THIS is the reason you need a converter.

The wire color for both your LEFT TURN and your RIGHT TURN are LIGHT GREEN/TAN. Although the wire colors are the same at the bulb sockets, these are SEPARATE circuits and must be wired to the correct wire at the converter box. (LEFT and RIGHT) The converter box will have an INPUT connection for EACH of these.

The wire color for your STOP lamps is WHITE/TAN. The converter box should only have one INPUT wire that connects to this. It doesn't matter which side of the vehicle you connect this wire to. All of the stop lamps are on the same circuit.

The converter will then have only one wire for LEFT turn and stop (usually YELLOW) this is the wire that needs to go to your trailer connector for left turn and stop.
The RIGHT turn and stop will most likely be GREEN coming out of the converter.

Sep 05, 2011 | Chrysler Concorde Cars & Trucks

1 Answer

How do I connect a trailer hitch power plug to the break lights and tail lights to my 2004 Hyundai Santa Fe.


Under the vehicle by the tail lights locate the lights wiring and look for this colors.
it's only four colors white-ground point,brown-parking lights,yellow-left side turn signal light and green-right side turn signal.
you are going to need a test light to find the correct wire,if you can't locate the wiring unther the vehicle then remove the tail lights and do the connections there.

Jun 09, 2011 | 2004 Hyundai Santa Fe

1 Answer

It was wired for a 4 wire flat trailer plug. the plug was ripped off and now there are wires coming from both tail lights and the drive lights on rear passenger and trailer dont work. Green, Black, brown/w...


You need to install a 3-2 wire converter. I suggest a CURT 56175 then
1.Using a test lamp, identify the corresponding wires in the harness for the left turn, right turn, tail lights and brake lights. 3. Temporarily remove the vehicle's negative battery cable from the battery. 4. Using wire taps, attach the input wires of the tail light converter to the corresponding vehicle harness wires identified in step 2 as indicated.
Converter Brown Wire: Tail Light Circuit Converter Yellow Wire: Left Turn Circuit Converter Red Wire: Brake Light Circuit Converter Green Wire: Right Turn Circuit
5. Locate a suitable mounting location for the ground eyelet on the vehicle near the converter on vehicle's frame or cross member.
And your ready to tow!

Mar 08, 2011 | 1999 Plymouth Grand Voyager

1 Answer

I turn the left signal light on and it works fine, I turn the right signal on and the vehicle right blicks, but the left trailer blinks. All brake lights work. What is wrong? Ground connects are good


Who installed the wiring on the vehicle ( dealer, self etc.)
Was trailer wiring pre installed or someone else did it
How old is the trailer?
it seems that there is a bad connection on the vehicles wiring. perhaps wrong part was used or connection from vehicle right turn- to wiring harness is not hooked on properly. Depending on how confortable you feel, test to see if there is proper electrical current flowing to the wiring harness ( right turn, left turn, brakes, headlights) you should be able to detect which area on the harness does not get power when the vehicles right blinker is on. It is not too complicated, just requires deductive reasoning and a tester ( about $5 at Kragens) No harm will come to your vehicle's electrical system by doing this; worst case scenario: you blow a fuse.
If vehicle is working properly, it will be a bad connection on trailer

Dec 21, 2010 | 2008 Ford Escape

1 Answer

How to identify rear turn signal and stop light wires in trunk to connect trailer lights


in the trunk there should be a multi plug near the lights on the left and right side, disconnect the plug, turn on the left or right indicator depending on what side you are working on first, use a test light (they are about $5 from your auto store) find a good earth on the vehicle body and connect the alligator clip on the test light to the earth, use the probe on the test light and touch each terminal in the multi plug until the test light blinks, that will be your blinker wire for that side, when you have found them see which colour wire it is and tag them.
Now turn of your indicators and turn on your park lights, use the same method as you used for the blinkers and tag either wire as you will only need one for the parking lights.
Now turn off the parking lights and get a friend to apply the footbrake, use the same method again and tak one wire as you only need the one for the brakes.
Now just connect the wires from the trailer to the wires in the vehicle and remember to connect the earth wire from the vehicle connector plug to the vehicle body

Oct 08, 2010 | 2000 Mercury Grand Marquis

4 Answers

No trailer right turn signal or brake light


Hey Boon,

The pinouts for a 7-way plug are as follows:
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

In both cases 4 is battery and 7 is reverse, aux or not used.

Double check your wiring using these lists as a reference.

Click here for my post on Trailer wiring

This should get us closer to the answer.

Best regards,
Mike

Sep 08, 2009 | 2004 Dodge Ram 2500

1 Answer

LEFT TRAILER TURN SIGNAL DOES NOT WORK


I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.

Nov 29, 2008 | 2000 Dodge Ram 1500 Truck

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