HI guys,
New to the site and so far I find it very informative! I am also having some trouble with my trailer lights. I have a 98 blazer 2 door which I got second hand. I use it to pull my boat. Every time I hooked the trailer lights up to the blazer after a couple minutes I would blow a fuse. So I looked at the wires on the blazer end and someone had connected the brown and the yellow together. I took that out and connected colour to colour ( RED and smaller WHITE wire left out) and I still am having problems. I dont blow a fuse anymore but I have no brake lights on trailer, no signals ( right signal in blazer wont even work) , and every time I hit the brakes the interior lights in the blazer dim....I am really stumped here. I hooked up the trailer to a different truck and trailer lights work fine. Anyone had simular experiences?
orrsey

ps the colours are matched up properly....thats why I am so confused

Trace the wiring harness in the truck and check it there. If the brake/signal/marker lights are working on the truck, then you should be able to trace them and get them fixed from within the truck.