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Old 07-07-2007, 08:50 AM   #1
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trailer wiring


I have left and right directional and brake lights, when I turn on headlights nothing works. Please help, going on vacation next week and need to get them working.

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Old 07-07-2007, 12:50 PM   #2
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trailer wiring


surely someone know the problem out there, is it that hard?

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Old 07-07-2007, 01:31 PM   #3
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trailer wiring


Shouldnt be that hard..

So the lights on the trailer work til you turn on the car headlights?

Is this a new trailer light install or has it worked before?
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Old 07-07-2007, 01:36 PM   #4
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trailer wiring


Nothing works on the car or the trailer or both when the headlights are turned on?


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Old 07-07-2007, 09:09 PM   #5
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trailer wiring


this is the first time hooking up trailer to vehicle. All directionals and brake lights work on trailer and car. As soon as I turn on the headlight for my car the trailer lights go off.
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Old 07-07-2007, 09:54 PM   #6
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trailer wiring


Did your wiring kit come with instructions?

Sounds like your brown for the connector on the car side is spliced to the wrong wire on your harness. With the car parking lights on, test it with a 12V test light to ground and it should light up.

How many wires are on both your Trailer connector and car wiring harness?

Normally four or five wires.
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Old 07-07-2007, 10:03 PM   #7
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there is 5 on the trailer, I believe right is yellow, left is green, brown is headlamp, white is ground and then there is a brown with yellow stripe?
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Old 07-07-2007, 10:35 PM   #8
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trailer wiring


What kind of car and is it a pull switch for the headlights?
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Old 07-08-2007, 07:51 AM   #9
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its a 05 toyota highlander. switch is on the directional lever.
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Old 07-08-2007, 10:45 AM   #10
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If you have five wires on the car side connector and five wires on the trailer side then I would think your problem is a bad ground since the lights do work until a large load is applied by turning on the headlights. Check the ground at the trailer connector and at each tailight on the trailer.

If you only have four wires on the trailer connector side you may need a converter from five wire to four. This is because your car has a seperate bulb on each side for turn signals and stops whereas your trailer only has one bulb per side.
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Old 07-08-2007, 06:52 PM   #11
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trailer wiring


check white wire. or hook a jumper wire between car metal and trailer metal. sounds like a grounding problem
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Old 07-08-2007, 07:18 PM   #12
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trailer wiring


Take it someplace to get it straightened out. I usually end up doing just that. It makes life easier. It doesn't cost much and you can get ready for your trip.
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Old 07-09-2007, 06:49 AM   #13
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trailer wiring


the problem was the white ground wire to trailer, everything works now. Thanks to all for the input and help.
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Old 07-09-2007, 10:27 PM   #14
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In the words of Homer Simpson....


WOOOOOO HOOOOOO!

Glad it worked out.
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Old 07-10-2007, 04:21 PM   #15
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yeah, thanks again for the help, just got done repacking the bearings, plan on taking it on the road to Maine, about a 4.5 hour ride. Kids want to take bikes up for camping.

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