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Old 05-07-2018, 09:05 PM   #1
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Tail light issue. 04 29BHS

Neither tail light works, neither turn signal blinks, left brake light works (dimly). Changed bulbs...same result. Voltage present at both fixtures.


Red rear marker lights on the side....work as turn signals but not as markers.

Seriously puzzled.
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Old 05-07-2018, 09:53 PM   #2
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Anything changed in that area lately? Repairs/mods/maintenance? Maybe you got a critter that chewed on some wires.
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Old 05-07-2018, 11:15 PM   #3
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Need to clarify what you mean when you say there's "voltage present at both fixtures".

Did you verify there was 12vdc present to power the 1) left running light, 2) right running light, 3) left brake/turn signal light, and 4) right brake/turn signal light?

Where did you place the voltmeter's positive and negative leads when you made these voltage checks?

Curious, are your trailer brakes working properly?
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Old 05-08-2018, 05:30 AM   #4
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First trip of the season.

Trailer brakes work, as do all the amber marker lights. None of the four red marker lights work.

Used a meter to pull 12V at each plug. I would have thought something (markers) would be lit up. I grounded on a screw; affixing the fixture to the trailer. Now that you got me thinking....there would be TWO hot leads right? Marker + Brake?

As far of changes. When the trailer was winterized the water pump was replaced under the sink. When I got to the destination last Thursday I could not extract the electric cord. After pulling off the outside plastic housing, and peering inside with a flashlight....there was a loose board tangling the cord. I don't know where this board came from but it has one plastic cable loop wrapped around some wires and screwed to the board. I will have to pull the fuse box from the inside in order to look/fix this board.
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Old 05-08-2018, 06:51 AM   #5
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It sounds like you have a bad ground somewhere.
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Old 05-08-2018, 06:57 AM   #6
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It sounds like you have a bad ground somewhere.
X2, On my HTT, the ground wire goes through the wall and down through the floor and is grounded to the TT chassis, basically under one of the tail lights. If I recall both tail lights have a common chassis ground.
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Old 05-09-2018, 12:41 PM   #7
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It sounds like you have a bad ground somewhere.
Yup
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Old 06-12-2018, 08:29 PM   #8
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Yup


I was unable to square it away but my mechanic found two poor grounds on trailer and one on the truck. All good now.
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Old 06-21-2018, 06:54 PM   #9
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That’s the simplicity of DC power. Power and ground and your good to go, relative ease of troubleshooting and repairs as well.
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