You have a short in your wiring harness somewhere. Some of those things you mention have nothing to do with eachother except for the fact that some of the wires run next to eachother in the harness. Something sounds like it shorting to ground. For instance, your turn signals are a simple example, they have a ground, and a switched hot wire. When the turn signal switch is engaged it provides power to the hot (the switches power is provided by the blinker unit). You then have a ground on one side, a hot on the other and the light lights up. That is literally the extent of the blinker circuit. If your working on anything else at all and it's affecting your blinkers then you my friend, have some wires shorting out together. Chances are it's likely the ground wires shorting with some hots, due to the fact that nearly everything ont he bike shares a common ground. Also, have you installed aftermarket blinkers or anything before you started having these issues? Often you can trace your problems back to a recent change or mod or something. It's hard to properly guesstimate your problem without more background info.