I was mowing a couple of days ago and noticed the battery light had come on. A little bit later the front PTO disengaged an would not reengage. The PTO engaged light lit when the switch was in the up position, but the PTO itself would not actually engage. The battery light only comes on when the PTO switch is engaged. Based on looking through different posts here, I have a feeler gage set and a multimeter on the way. Once the air gap is correct, if the PTO won't engage where should I start taking readings and what should I be looking for? Based on the symptoms, it seems likely it is electrical and not the air gap. Although I haven't taken readings on the battery yet, it seems fine. The tractor starts just fine. Thanks for any help.