need help ! ram wiring...

this is a 2003 ram 1500 w/ hemi, all of the fuses and flashers are in a big box in from of the battery, the trailer lights have their own fuses in this huge box. i looked for the flasher , but it seems to be inside the box , and under the fuse board, not easy to get to. i did have the trucks taillights off, cleaned all the connections , but not really any thing wrong with them . the power for the trailer turn signals seems to run from the fuse box on its own circuit. but all of the wires run in a common harness. there isnt much of any wiring under the dash.. it is all up under the hood... it got dark before i got it all apart , i was hoping some body here had this same problem ,to get a better idea of where to go next....thanks ...