Question regarding my 1997 ranger trail trailer. After observing some poor work done by the previous owner, I decided to replace light fixtures and all of the wiring. After getting everything installed, the running lights are working without any problems, however the brake lights, nor turn signals are working. Prior to running the new wires threw the trailer, I set everything up at the back of the vehicle and everything was working as expected, brake lights and turn signals included. Now after installing everything, it appears that there is voltage being dropped, there is still just enough to light the running lights, but not quite enough to power the brighter brake and turn signals. All of the grounds are fixed in the same places as they were prior, when everything worked well. The only thing that makes sense is that there is a ground issue dropping voltage, however I am not sure that the running lights would work if the grounds were bad. I have attempted to ground everything in different places to no avail. I am certain that everything on the vehicle side is good, indicated by the fact that I am getting voltage to the actual light fixtures, just not enough, and there is in fact full voltage coming off the vehicle. I have attempted to clean the ball and hitch to potentially better/assist in grounding the trailer, without any luck. The only difference from testing everything at the back of the vehicle, and after running all the wires to the actually light fixture locations is the grounds, but I can't seem to figure out the problem. Anybody have any thoughts? Thanks in advance!