Question about 2003 Harley Davidson FLHR Road king

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I have a 99 harley ultra classic. the rear tail light has 3 wires, black, red and blue. the black i figure is ground cuz it was grounded on the oem tali lamp, but the blue and red i cant figure out. i have a aftermarket tear drop tail lamp with a white, red and black 3 wire harness. the white is the ground and the red is dimmer light and the red is brighter. i cant figure out how to wire up the brake/ stop light. i step on the brake and i dont have brakes/ stops. any help with the oem wiring color/ function description willhelp. thanks.

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If you have three wires going to your original tail lamp, you're probably right that one is ground, one is the brake light and one is the tail light. Since you say the black wire was grounded in the OEM tail lights this leaves you only two wires, one for the brake and one for the taillight. Simply turn on the ignition switch to turn on the headlight and you one of the wires should go "hot" or have electrical power on it. Use a volt ohm meter to figure out which one, Once you find the "hot" wire, this is the tail light wire. Then, step on the rear brake and the other wire should go "hot". This is the brake light and should be the brightest of the two filaments in the tail light bulb.

Good Luck
Steve

Posted on Mar 16, 2011

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I would suspect that the black is still ground and the red goes to the red from the bike and that the white is for brake switch when you press the pedal or lever. Hook it up that way and see what you get. Good luck.

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Posted on Mar 16, 2011

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1 Answer

Wiring harness to rear tail light assembly


Hi Anonymous,
Brake light--red with yellow stripe
Tail light--blue
Ground--black
Good luck

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Hello all,

For those of you that need to wire up a trailer or have to 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.

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
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Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
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Recreational Vehicle:
White = Ground - 1
Blue = Electric2_bing.gif Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
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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) = Battery2_bing.gif, 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

A test light and a 12VDC power source can be handy for trouble shooting.
Best regards
Mike

on May 16, 2010 | Toyota 4Runner Cars & Trucks

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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
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

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1 Answer

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Have nice day.

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