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The lights in my fema trailer are very dim. If you turn on any other electric device they get even dimmer. Does anyone have a clue??

FEMA trailer lights are very dim. Have not always been this way.

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SOURCE: dash lights go dim when lights are turned on

Are your light controls on the Steering Column or on the Dash? Should be a Small Dial on the Dash or Turning the Dial on the Lights on if on the Column will work.

Posted on Dec 31, 2008

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SOURCE: trailer signal lights are dim when hooked to '04 tacoma

Look for ground issue, in my opinion the frame should not be used as a ground, always makes problems, eventually, but run an external ground to the lights and view results....

Posted on Sep 15, 2009

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I have 2006 f250 super duty, I have running lights on trailer but no turn signals or brake lights. the trail lights all work on my other ford truck.

If indeed you have the wiring correct, brown for run lights, green for right turn and yellow for left turn, and is not working on one trailer but not on the other, ALWAYS go to the ground connection every time. I've wire many a trailer and found that if no lights or only some working, It's always the ground connection. Check this with a pair of jumper cables between a clean spot on the tow chassis to a clean spot on the trailer chassis and turn the lights on and try the signals and brakes. That's the best test to do when checking the system.

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Most trailers use a single bulb system with the bright filament used for the brake and turn signal, and the dim one for running light. Your truck, however, has a separate bulb for brakes and turn signal, thus requiring the use of a logic box to operate the trailer lights. Get one from parts store, install and all should be good.

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Trailer signal lights are dim when hooked to '04 tacoma

Look for ground issue, in my opinion the frame should not be used as a ground, always makes problems, eventually, but run an external ground to the lights and view results....

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Your turnsignal flasher needs to be replaced with a heavy duty flasher.
also, your boat trailor wiring harness is grounded incorrectly or the harness pig tail is wired incorrectly.
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sounds like you lost ground to the trailer. Be sure the ground wire on the truck and trailer are grounded well.

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