Have a left trailer tow light low circuit, dont know if there is a fuseable link somewhere or if I need to just replace the fuse or relay. Anyone have this happen to them? and if so was it a simple fuse to replace, or more indepth?

 

replaced fuses that were bad, turn signal and brake light work now, but when I turn on driving lights, still that side of trailer has no light.

 

Sounds like you have a short or a bad ground on that side of the trailer's system.

I built some clearance lights into our scout trailer's removeable canoe racks that worked great, until others used exposed wiring as strap anchors. Another leader hooked up his van and lost tail lights and dash lights (dodge caravan). We tried to get it all working, but discovered that nothing would work on anyone's vehicle until we unpluged the rack lights. Get an Ohmeter and check out that side of the trailer wiring.