HELP: Headlight switch triggering STARTER!!!

^^I've heard of that "trick."

Yeh, those small transmitting loops are a whole different deal. I vaguely remember the first one I saw way back in old QST? CQ? magazines and back then had no imagination for the types of circulating currents that exist on those things. That is why, of course, the MFJ one uses a form of butterfly cap--because no shaft contact brush could ever handle the RF current