need help ! ram wiring...

i need a little help here, problem is the trailer wiring on my 2003 ram pickup, it has the factory trailer package and wiring . problem is I only have 7 volts on the turn signal wires. the running lights do have 12 volts. the trailer lights do work when powered up with a battery charger,
this thing is driving me nuts, I have tried the basics (grounds , clean terminals, fuses , etc ) but no luck .. still only 7 volts coming to the plug connector on both turn signal wires... any one run into this befor ?
thanks