have a new 300 D only have a couple thousand hrs. on it. never had any problems tell the last couple of weeks. The thing is that when you strike an arc it won't idle-up. You can see little sparks if you look really close with your naked eye, even if you put the stinger directly on your ground it still won't idle up. If you click your grider button the machine will idle up then you are good to go. That becomes a pain when your holding something to tack up. I was just wondering if anyone can pinpoint the problem. Thanks once again for any responses. This forum is my go to place for all my problems. Thanks for all your help boys!