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Car to trailer wiring problem

My car is wired for electric service trailer brakes, and works fine, but will not work on a trailer fitted with out electric brakes, it is incompatable and blows fuses, what do i need to do to overcome this problem ?

i am in South Australia and we use 7 pin round plugs

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Most likely the trailer wires dont match the truck wires. you will need to verify that the truck is wired correctly and then that the trailer is wired to match your truck. problems usually arise after someone has BORROWED a tralier and made the trailer wires match THEIR truck trailer wiring here is standardized but people wire them up any way the can, and it causes problems when that trailer is borrowed or sold.

Posted on Oct 03, 2009

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My trailer that has electric brakes installed and a 7 prong plug connector. My Tundra has a tow package with a 7 prong plug.


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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
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Brown- Tail Lights
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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.

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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
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Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

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Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7


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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
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Red = Left turn/Brake - LT
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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
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Best regards
Mike cf3f8fc.gif

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