By no stretch of the imagination is this meant to be rude, Jon...but what in the hell are you talking about?

I'm assuming that the turn signal problems is on your bus...but then it could be on the toad because that's where the diodes belong.
If you could go into just a teeny weeny bit more detail I'm positive one of our many electrical geniuses could help you. Like the brand of the bus and/or the toad, whether or not the signals work properly on the bus without being connected to the toad, do the toad lights work properly independent of the bus....just little things like that.

Bob