10 volts is a dead battery, too dead to keep ignition.
Remember, a battery at 12 volts is dead. my guess your alternator died or something else happened, and you kept running
Look again. That Walmart battery adapter should be thrown away. The batter cable ends sanded with 320 grit, and bolted to the threaded studs that also need to be sanded
Warranty covers materials and workmanship. Not abuse
Water ingestion falls under abuse this is where your boaters insurance comes into play. call your insurance company
The fact you are renting to the public is the biggest risk. Not the equipment. You need lawyers to draft an indemnification clause in your rental agreement. Remember, the general public now needs to be told not to eat tide pods and drink batter acid. And they will find an ambulance chaser to...
If your compression gauge is correct, your motor may have issues. Hopefully it's just that it has been running rich
Get the carb TKS issue fixed, then after running, check again
