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What is the light blue wire at trailer plug for a 2001 GMC 1500

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Stop lamps

Posted on Nov 27, 2012

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2001 dodge ram 1500 v8 spark plug wire diagram

the firing order is 1 8 4 3 6 5 7 2 clockwise around the cap

Posted on Jan 03, 2009

  • 66 Answers

SOURCE: spark plug wiring diagram

I dont understand why you would need that unless you took off all the wires and took out all the plugs and forgot how the wires were.I have the same truck and I always do the plugs and wires one at time to make sure I make a mistake.If this is your ploblem let me know because i might be able to walk you though it.

Posted on Jan 22, 2009

farroutideas
  • 78 Answers

SOURCE: wiring diagram or fuse box diagram-2007 GMC Envoy Denali

Hi there;

Here is the wiring diagram for the trailer wiring for your truck.
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Hope this helps
Farrout!

Posted on Mar 18, 2009

  • 1779 Answers

SOURCE: 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.

Posted on Apr 11, 2009

Mike258
  • 1498 Answers

SOURCE: i need a wiring diagram for a 2001 ford f150

Hey Bryan

I've got them for Six and Four wire plugs

Six wire 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

Posted on Sep 09, 2009

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Have a 1994 Dodge Ram 1500 4x4 1500 with wiring problems. The original problem was a brake light out on the drivers side. I changed the tail light plugs. With head lights off I had brake lights with head...


Your truck may have had the factory trailer tow package, but that did not come with a wiring connector in that year. There should be a wire harness under the rear of the truck near the center of the bumper with 7 wires of the following colors/characteristics -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Tail Markers (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
Violet/Black - Backup Lights (Thin Wire)
Dark Green/Red - Left Stop/Turn - (Thin Wire)
Brown/Red - Right Stop/Turn - (Thin Wire)
Black - Ground - (Thick Wire)



Under the dash, the brake controller wiring should be -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Ground - (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
White/Tan - Brake Light sense - (Thin Wire)

Hope this helps.

Mar 19, 2013 | 1994 Dodge Ram

Tip

Trailer Wiring Cheat Sheet


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.

The following are the accepted standards for different trailer types.
The different plugs and connectors used are marked with either a number or letters. Having the functions of each in advance can save a lot of trial and error when troubleshooting..

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
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 Dec 25, 2009 | GMC Blazer Cars & Trucks

1 Answer

What is the function of the 8 wires for the factory rv plug?


The 8 wire plug on newer models is for trailer hauling. The wires give power to the following; break lights, marker lights, backup lights (as equipped) parking lights, electric breaks (larger trailers will have these) one wire is a ground, and, through a positive wire, will trickle charge your trailers house batteries also. There is an industry standard to wiring one of these plugs, so you should be able to purchase any "newer" style trailer (tent, tow behind or 5th wheel, or camper) and the wiring harness will be wired accordingly. Any RV shop or auto shop should be able to provide a schematic for the wiring if you require one.

Aug 05, 2011 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Have issues with trailer lights. Both turn signals on trailer flash when I use left or right turn signal. Have 7 pin factory plug. Lights on trailer work fine, hooked up to 97 Silverado. Act funny on 2000...


Standard wiring colors are as follows:

4-Way

5-Way

6-Way

7-Way

Green

Yellow

Brown

White

Red

Blue

Purple

Right Turn & Brake

Left Turn & Brake

Tail Lights

Ground

Backup Lights

Electric Brakes

Auxiliary Power
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
White- Ground
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power

It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.

Jun 26, 2011 | 2001 GMC Jimmy

2 Answers

Right trailer turn signal does not work when hooked up to my 2003 gmc sierra. The light does work on the truck. Trailer light does work when hooked up with my other vehicles.


Check the plug at your gmc outlet, your right signal wire has been damaged before the plug somewhere. If you have a test light switch your right signal on and make sure it is working at the plug on your gmc, you will find it is not working, than trace the wire back from the plug till you find where it has been damaged or you can run a wire straight from plug to your right signal.

Jun 09, 2011 | 2003 GMC Sierra 1500

1 Answer

Im hooked up to a trailer, I have blinkers and brakes, but no hot for running lights, or constant hot wire at the plug. Ive used a test light and cant find a hot wire under the truck at the plug


All late model gms have a seperate fuse for trailer lights in the under hood fuse box. Your truck running lights will still work but no trailer lights

Feb 13, 2011 | 2001 GMC Sierra 2500HD

2 Answers

How do you install an electronic trailer brake controller in a 1995 GMC Suburban 1500?


a brake controller has 4 wires on it, Black, white, blue,red.

Black is positive battery 12 volts connect to 30 amp circuit breaker to the battery

White goes to good solid ground

red connects to white wire from the brake switch

blue wire connects to 7 way trailer connector at rear of truck. If the truck has trailer package you will find the blue wire and red wires under brake booster taped to the harness you can connect your blue brake control wire to that blue wire. At the rear of the truck the other end of the blue wire will be taped to a harness under the rear of the truck. you will have to now connect the blue wire to the blue input on your 7 way connector

Sep 16, 2009 | 1995 GMC Suburban

1 Answer

Replaced outlet,on car, for trailer, when hooked up, no lights on


sounds to me like your ground wire may not be conducting properly

Jul 10, 2009 | 2003 GMC Sierra 1500

1 Answer

93 GMC Suburban, No Tail Lights


Check the trailer plug ground first. If in doubt. Ground in another location. Make sure the area is free of rust and the ground is tight.

May 10, 2009 | 1993 GMC Suburban

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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