I'll be as brief as possible: 1988 Coleman Chesapeake No exterior lights worked. I replaced the pup side 4 pin conn to where wiring enters trailer frame. (good ground too). Side note: this was a 6 pin, but prior owner converted to 4. I also replaced the tail lights...old ones were really nasty. After this, i have tail and running lights...but no turn signals or brake lights. TV is 03' Land Rover Discovery 2. Tow harness is brand new & ran everything fine on a trailer I towed in August. Any suggestions?