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Old 05-26-2016, 12:50 PM   #1
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Camper lights and marker all DIM

all my marker lights are DIM when hooked to tow vehicle. Some items Ive been suggested to try are:

put camper onto the hitch for a ground connection.

Vehicle was off so connect trailer when tow vehicle running.

any ohter ideas of what to do or try.......they were all on but DIM.. and I had NO tail lights...but electric brake was not hooked in but I would not think that would do it.

Tow vehicle 2012 Ford F150 FX4

thanks for advice.

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Old 05-26-2016, 06:43 PM   #2
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Have you put a voltmeter on the pins of your trailer connection? Contact cleaner sprayed on both the plugs and sockets may also help. You should have a ground wire in the harness and hook up from the truck and trailer, you should clean those connection points as well.
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Old 05-26-2016, 06:49 PM   #3
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Yep, sounds like the old ground wire problem. DC circuits need good, clean connections. The best tool is a digital volt/ohm meter to test things.

If you get 12 volts or more at the truck connector, pop a lens from the marker light, pull the bulb and check for same voltage there. Probe the center pole in the socket to ground (red wire to center, black to ground).
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Old 05-26-2016, 10:18 PM   #4
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Last time I tried to jack up my electric jack I couldn't for the life of me understand why I had good battery but the jack would not move. Keep in mind I went to college for electronics for over 4 years so this could happen to the best of us. I of course found a faulty ground. Just had to clean all the grounding terminals and good to go.
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Old 05-27-2016, 07:08 AM   #5
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ok so I went back and have found that with this new truck 2012 F-150 vs 2002 The truck wiring is a little different so I moved my trailer connections and also verified some of my camper side connections ex. tail and stop and im getting there but still issues.

When I check my truck side with a test light all I seem to get is constant 12v+ but I cant seem to get a tail or blinker on the test light. I need to go back and review this big time as its all messed up.
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Old 05-27-2016, 08:18 AM   #6
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Bad ground
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Old 06-12-2016, 05:48 PM   #7
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The wiring should be the same on a 2002 and a 2012. If it isn't someone has rewired it. They come from the factory wired to the RV industry standard. You can get a tester that plugs into the truck to test the wiring, and then if the trailer still doesn't work you at least know that the problem is in the trailer. I also agree that the single most common problem is bad ground connections, there are multiple grounds throughout the trailer so check them all.
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Old 06-13-2016, 11:06 PM   #8
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Sometimes the ground wire to the frame had been painted, creating a BAD ground. I once painted my battery and shorted out the battery. Yes I was century younger, but things happen. How about running a pair of wires from the Truck connector and connect to a light and compare the light. Maybe a chipmunk had sampled the insulation and grounded out.
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Old 07-07-2016, 08:14 AM   #9
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Take a separate battery and jumper wires into the 7-pin. Put a ground into the 7-pin and put it on the battery. Connect another piece of wire to the hot side on the battery and touch it to the left turn side. See if it comes on and is bright. Do it for all of your lights. If it all works fine then it's not in the trailer, it's something else. I would say a ground is the root cause and could be the trailer grounds or the ground between the truck and trailer. Excessive rust on a hitch ball can cause it.

I kept blowing left turn fuses on my truck and just on this one particular trailer. Checked everything I couldn't find a reason. Spliced in a new 7-pin on trailer and haven't had trouble since.

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Old 07-09-2016, 03:58 PM   #10
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If hitching to the tow vehicle fixes the problem you definitely have a bad ground, you do not want to count on the hitch ball/coupler for the ground connection.
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