Yet another wiring question - BMW Luxury Touring Community
 
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post #1 of 8 Old Dec 17th, 2005, 9:55 pm Thread Starter
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Yet another wiring question

I picked up a small 3-rail trailer to haul the dirt bikes. It had old connector on it and was due replacement. So I took out the connector, the wiring and the two old tailights. Installed new taillights (round with 2 wires coming out of them. One balck one red.) re wired the entire trailer with a flat 4 way universal connector. Put a 7-way to 4-way adapter on my bumper outlet and then plugged the trailer connector. I have running lights But no turn signals.

The universal wiring harness I bought had two sets of wires and a single wire for ground (white.) The two sets of wires had Brown/yellow and Brown/Green. According to the schematic, green was right running light and yellow was left running light. That left brown for each side.

I used green on the taillight red on the right side and yellow on taillight red on left side. Each brown went to the corresponding black on the taillight.

The taillights have dual filament bulbs.

I checked the fuses on the truck and everything is ok. The only thing I did not check was brake lights. The white wire was grounded to the trailer tongue (maybe this should be changed.)

Anyone see anything glaringly wrong? swap the wire connections at the taillight?



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post #2 of 8 Old Dec 17th, 2005, 10:30 pm
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Put a 7-way to 4-way adapter on my bumper outlet and then plugged the trailer connector. I have running lights But no turn signals.end of QUOTE]

I agree with what you did to the trailer. Time to get the volt/ohm meter working to see what is hot, coming out of your 7 to 4 adapter, and confirm that the grounds are good if your brake lights are also inop. You might just want get another 12Volt source and work with just the 4 wires that go to the trailer to confirm where the problem is. The ground is usually my problem on old stuff. B.B.

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post #3 of 8 Old Dec 17th, 2005, 10:40 pm Thread Starter
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Thanks. I'll look into it some more in the mroning.



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post #4 of 8 Old Dec 18th, 2005, 12:03 am
 
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The Brown is running lights. That's why there is one down each side. I'm not sure with your tail lights which color to hook it to but turn on the running lights on the truck and test to see which wire, red or black, lights the dimmest filament. That's the running lights. The bright filament will be turn/brake lights.
I'm guessing the black will be the running (dimmest).

White goes to ground. Make sure your new lights have a good ground through the mounting bolt. Scrape some paint off if you have too, then put a little paint over it once the nuts are tight.

Green goes to right side turn/brake.(bright)

Yellow goes to left side turn/brake. (bright)

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post #5 of 8 Old Dec 18th, 2005, 7:48 am
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Check the ground

Raffy: As long as you have confirmed that the lights are dual filament, the ground may be the problem. Rick has it right: green = right turn/brake; yellow = left turn/brake; brown = parking light (running light).

Check that the light case on the trailer is firmly grounded to the trailer. Grind the area where the lights are bolted to the frame to make sure there is a good connection. Then connect the white wire from the connector to the trailer frame to insure solid connection. Don't rely on the ball/hitch for ground contact.

B.B. also has good ideas for checking the lights with 12v source to ground. When in doubt SMOKE TEST!!



Hope this helps.

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Last edited by ksailor; Dec 18th, 2005 at 7:54 am.
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post #6 of 8 Old Dec 18th, 2005, 8:02 am Thread Starter
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Thanks Chuck and Rick:

I'll check for the ground. I bolted the white wire to the tongue through a pre-existing hole. If the ground is not the issue then the next step is to re wire the taillights.

Right now I have yellow to red on taillight and brown to black, green to red and brown to black. Will swap the colors and see what happens.

Will let you know when it gets light out here and I can work outside again. It's pouring rain.



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post #7 of 8 Old Dec 18th, 2005, 10:32 am
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Re: Yet another wiring question

Quote:
Originally Posted by RaffyK
I picked up a small 3-rail trailer to haul the dirt bikes. It had old connector on it and was due replacement. So I took out the connector, the wiring and the two old tailights. Installed new taillights (round with 2 wires coming out of them. One balck one red.) re wired the entire trailer with a flat 4 way universal connector. Put a 7-way to 4-way adapter on my bumper outlet and then plugged the trailer connector. I have running lights But no turn signals.

The universal wiring harness I bought had two sets of wires and a single wire for ground (white.) The two sets of wires had Brown/yellow and Brown/Green. According to the schematic, green was right running light and yellow was left running light. That left brown for each side.

I used green on the taillight red on the right side and yellow on taillight red on left side. Each brown went to the corresponding black on the taillight.

The taillights have dual filament bulbs.

I checked the fuses on the truck and everything is ok. The only thing I did not check was brake lights. The white wire was grounded to the trailer tongue (maybe this should be changed.)

Anyone see anything glaringly wrong? swap the wire connections at the taillight?
Raffy; The set of brown wires are the running light circuits one right, one left. The green wire is for the right turn & right brake light circuit. The yellow wire is for the left turn & left brake light circuit. Is it possible you have a dual element lamp, but the bulb receptacle is either not set up for dual elements or not grounded properly. Usually these trailer circuits get fouled up due to poor grounding. Attached is a simple wiring diagram, hope this helps:
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Jerry
2004 K1200LTC Night Black

Last edited by C. Buckman; Dec 18th, 2005 at 10:37 am.
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post #8 of 8 Old Dec 18th, 2005, 11:01 am Thread Starter
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Got it fixed. I switched the wiring to brown on red and yellow to black on left and green to black on right.

Everything works now. Ground spot was good.

Done. Off to San Jose to pick me up a new to me bike. Details will follow.



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