No rust.
I didn't try the load test as you suggested. I know the 12 volts is getting there at starting side.
Today it is working just fine.
It's a diesel and it takes a bit more to turn over. I think I'll try a load test on the battery by it self. I have a resistance tester for that.
I am having a weird problem which should be simple to fix but its' not.
Starting the Kubota (trying to start) sometimes yes some times no.
A couple of years ago I replaced the starter motor and the attached solenoid. Not long after, the problem started up again. Click! but no start. Click...