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Old 10-22-2012, 06:15 PM   #1
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Trailer Lights, Possible Ground Problem

My tow lights do not work unless the trailer is attached to the tow vehicle. It appears that the lights depend on the attachment for the ground. It seems like it should be getting a ground from the white wire that comes from the truck that is connected to the white wire in the trailers electrical harness. My question, is there a ground wire somewhere on the trailer? I have a 25RK bumper pull.

Thanks.
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Old 10-22-2012, 06:21 PM   #2
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Welcome to the forum. It is normal for the trailer lights to not operate without being plugged into the tow vehicle unless the 7 pin connector is "jumped". See this link:

https://www.jaycoowners.com/showthrea...connector+jump
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Old 10-22-2012, 06:35 PM   #3
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Quote:
Originally Posted by Crabman View Post
Welcome to the forum. It is normal for the trailer lights to not operate without being plugged into the tow vehicle unless the 7 pin connector is "jumped". See this link:

https://www.jaycoowners.com/showthrea...connector+jump

What he said.
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Old 10-22-2012, 06:55 PM   #4
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I think he is saying is that the ground between his TV and TT is broken and that the hitch makes the ground. Totally unsafe with an unreliable ground with the trailer brakes.

How I would diagnose? Meter is my tool. I would take the ground pin on the tv and the tt and touch a phisical piece of chassis. Whichever is open or high resistance, I would wire a new ground to.
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Old 10-22-2012, 07:16 PM   #5
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Originally Posted by ChooChooMan74 View Post
I think he is saying is that the ground between his TV and TT is broken and that the hitch makes the ground. Totally unsafe with an unreliable ground with the trailer brakes.

How I would diagnose? Meter is my tool. I would take the ground pin on the tv and the tt and touch a phisical piece of chassis. Whichever is open or high resistance, I would wire a new ground to.
Yep, I see your point. My mistake.
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Old 10-22-2012, 08:08 PM   #6
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My take is Crabman had it right the first time.

He states the lights work when hooked up to the TV. That's normal.

Tow lights do no work when unhitched.

Hopefully he will return and clarify the issue.
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Old 10-22-2012, 08:10 PM   #7
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Originally Posted by tnchuck100 View Post
My take is Crabman had it right the first time.

He states the lights work when hooked up to the TV. That's normal.

Tow lights do no work when unhitched.

Hopefully he will return and clarify the issue.
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Old 10-22-2012, 09:28 PM   #8
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I am back. If I plug the lights and brake in without hitching the trailer to the tv, the lights don't work. Once I hitch the trailer the lights work. I wondered if there is an independent ground on the trailer that might have come loose, causing the need for the hitch to become the ground. Hope that clarifies the issue.
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Old 10-22-2012, 09:56 PM   #9
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I thought this was the issue. I like taking simple measures. Do you have a meter or a test light? Look at this diagram..



Meter with Ohm or Continuity tester
Take Pin 1 and touch a good ground on the TV or Trailer. You should get Continuity. If you don't on either the TV or Trailer...or both, then I would look into where the wire is broke or just run a new ground.

Test lite
Take the test lite to pin 4 and test both to pin 1 and to a good ground on both the TV and the trailer. See if the test light illuminates. If between pin 4 and 1, on either the TV or the trailer, the light does not illuminate, you found where your problem is.

That is my way of diagnosing. Everyone has their own method that works well for them.
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Old 10-23-2012, 12:45 AM   #10
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When you say run a new ground, do you mean abandon the white wire on the trailer? By the way, the brakes have worked even when the lights don't.
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