The most common problem is blown main fuses on the power unit which blow when you operate or try to operate the slides with low batteries and the power supply not connected to the landline power source.
SOURCE: 2001 Dodge Ram 2500, no running lights on trailer
The truck is protecting itself from the load impose by the trailer.. Chk the plug on the truck for wire gauge size. Turn any electrical loads off on the trailer, any and all. If fuse still blows then the fuse is either underated or the trailer has a dead short. In fact turn trail main power panel of. All lights work you say. So ck the inverter for defect byturning off the inverter on one of the trailers.
SOURCE: 2008 super duty trailer pigtail won't send power
Check your fuses under the hood, not just under the dash.
SOURCE: factory trailer connecter for trailer plug in - no current
Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Check ground.
SOURCE: no left turn or brake light on left for trailer
There are separate fuses for the trailer turn signals.Make sure they are good.They are in the under hood fuse block.If they are then check for corrosion in the trailer harness wiring.Hope this helps.Good luck.
SOURCE: Trailer wiring problem. Tow vehicle is a 2008
Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.
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