I will have to get my hands on a voltmeter to know for sure, but this is very, very strange:
It's been so dry, I hadn't mowed in more than two weeks, so the tractor has sat in the garage. I put a trickle charger on it for an hour before I tried to start it. No go. Starter just clicked a little. Headlights were also dead. Put the battery pack jumper on it. Started right up.
Mowed for two hours. Worked great. I shut it down in the driveway, and finished the trim work for about 30 mins. Came back. Started right up WITHOUT a charge. Shut it down again after a minute. Started right up again without a charge. Headlights now work with the tractor running, and not running.
I keep the ignition key in the 'ON' position when I mow. The red CHRG (charge light) on the dash stays red when I mow. Is that normal for the red light to be on during operation? I notice if I turn the key position to off (and not cut the fuel to turn off the motor), the light goes off.
I'll have to see if that's in my owner's manual tonight. Might be.