So I pulled the trailer wire harness off the truck, and one of the posts inside where the trailer plug goes into was completely disolved, blue powder everywhere, possibly could have done something, but I checked all of the trailer fuses and they are still intact.

 

^ I think that there is the issue...

 

The harness was the kind you plug in and can remove. The part attached to the truck looks fine, just the adapter one had the corrosion issue. Is there any way to remove the turn signal switch to test if it is bad? Or do I just have to buy a new one?

 

So after all that, turns out that the side marker lights were burnt out, and the flasher that one parts store sold me was bad. Changed the side marker bulbs and put in a new flasher and v'wala. Blinkers work

 

So it was the bulb.. lol Well at least it was a cheap fix.