Trailer lights aren't working

[mainer]

I borrowed a trailer from a guy at work and found out not all my trailer lights are working. I have no turn signals or brake lights, i do have running lights and trailer brakes. I dont see any brakes in the harness, all the connectors seem to be in good condition. I dont have an owners manual, is there any fuses inline on just the trailer light harness? No blown fuses under the hood. I thought about replacing the plug at the bumper. Any suggestions?
Towing on sunday, so i need to fix it tomorrow.

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04.5 2500 5.9, 4x4, Turbo silencer gone, Amsoil 6" filter, Smarty, 5" TBE, Isspro boost, pryo,and trans temp, Quad Rail pressure gauge, Goodyear DuraTrac's on 18" Black Rockstars, Goerend Trans

[milesengineer]

need to take it to the dealer and have them reset the stupid computer that controls the trailer plug. been there done it.

[CowboyCummins01]

check all the fuses in the under hood box, Do you have brake/running lights on the truck itself? Are all the wires tighteneddown in the trailer plug itself, iveknown some to come loose and leave me spending 5 hours on the truckitself before my neighbor points out theres wires sticking out of the trailer plug

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2001 Ram 2500HO, NV5600, Just an ol ranch truck,362rwhp,811ft/lbs 10/24/09
Just Ledoux it-RIP Chris Ledoux

[double d truck]

a quick way to check the plug on your truck take a 12 volt ligh stab tester and check the appropriat tang in the plug housing on the truck if the light goes on you have power to the plug and the trailer wire are bad somewhere

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07 6.7 4x4 2500 6 spd Auto, Inferno Red Big Horn Edition w/Leather Interior, egr/dpf came up missing, Pyro/Tranny/Boost Gauges, Araid drop in air filter, Smarty S67 sw3 vgt3, Reese Tow Beast Class V Reciever 14k Rated bumper pull w/weight distribution and dual cam sway on trailer, Air Lift Air Bags w/onboard compressor and single gauge, Extendable heated/power led signal/marker tow mirrors, Dual Beam Spot and Fog Lights

[mod9]

in trouble shooting always start at the source of the signal.but in your case i would start at the the plug-in on the back of your truck.with a test light,check all of your leads off of your truck .if they all work correctly then your truck isn't the problem.

trouble shooting is frustrating thing...have fun....lol

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01 2500 4x4,built tranny,fuel,pyro,transtemp,boost gauges,airdog100,B.H.A.F.,j-hook,silencer ring removed and never going back on!!!other mods coming soon.

[mainer]

Well it only turned out to be the plug, i wiggled the trailer plug alittle and bent the prongs, then they started to work. Somehow i lost me license plate lights, fog lights and rear driver side running light using a test light last night.

I checked a running light to make sure the test light was working and after i put the light back in i had lost the lights

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04.5 2500 5.9, 4x4, Turbo silencer gone, Amsoil 6" filter, Smarty, 5" TBE, Isspro boost, pryo,and trans temp, Quad Rail pressure gauge, Goodyear DuraTrac's on 18" Black Rockstars, Goerend Trans

[CowboyCummins01]

you might have grounded it out and shorted the line. check fuses again

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2001 Ram 2500HO, NV5600, Just an ol ranch truck,362rwhp,811ft/lbs 10/24/09
Just Ledoux it-RIP Chris Ledoux