So after a couple of years I finally let my brother and his family, along with another family apparently, spend the week I was at the beach at our lakehouse.
After 2 weeks of no boat I got to the house late Friday afternoon. Didn't unload the Jeep because all I wanted to do was get in the boat and go. Took the cover off and leaned over to turn on the blower and sure enough the blower and bildge switches were flipped. Dead dead dead battery. The "3/4" of a tank he swore he left in it was more like 3/4 of an 1/8 of a tank and the cooler his friend left on the in the front locker had rotted stank beer in it that still stinks.
I can't be mad at my brother really but I'm pretty sure he has enjoyed his last unsupervised boat use.