Had a diagnosis done today at a top rated local auto electric shop for the turn-signal issue. They said the problem is actually in the trailer tow wiring harness under the bed and is affecting the rest or the circuitry. Something about a brown and a green wire, the trailer brake/tail light circuit. I was told that if I were to pull the fuse for the trailer light circuit, the problem would go away. I pulled fuse #15 and voila! Now I just have to locate where the wires are actually crossed and better insulate them. I'm just afraid that the problem wires are in the harness located in the frame rail along the side of the tank, requiring removal of the tank.