Sometimes lately when starting up my rig, there is a loud buzzing noise. I can't quite tell, but it seems to be the starter. I've let it run for a few seconds with the hood open, and I can't tell where it is coming from,and I'm afraid to let it run with that horrible racket. If I gently turn the ignition, just enough for it the starter to just engage, and let go of the switch, I can turn the motor over and get it started without the racket. I'm guessing it is the ignition switch stuck. Anyone else run into this issue before?