Small Engines (Lawn Mowers, etc.): JD GX 255 Lawn tractor with Kohler engine, battery cables, auto parts store

Question
Hi Eric,

I started my mower for the first time this season after changing the oil. Starter sounded a bit clunky, battery a bit low but it started and ran fine for 2 hours. Shut it off to trim. Went to restart, and the starter sounded clunkie again, engine coughed...would not start.
Then it seemed to kick over to this mode where the starter sounded fine and the engine turned, but no sign at all of starting (like a fuel cutout).
I discovered after that that the starter now engages directly from the ignition "On' position..even if I'm not in the seat with the brake on.
Went the throw parts at it route and replaced the ignition/board module. The On position then behaved, starter sounded clunky but engaged, almost started, but now I'm back to square one with a smooth sounding starter engages from the "On" position...and no sign of starting almost like I blew the board again (pure speculation here). That said there were a couple of times last week where the ignition behaved again for a try (proper 'On' position behavior) but would not start and quickly defaulted back to the "On' position starter engaging craziness.

Any thoughts...thanks

Answer
Just to get a clear understanding, you replaced the igniton switch, correct?

Weird problem.  Have you had the battery load tested at you local auto parts store?

Have you tried dis-connecting the battery cables and cleaning the battery terminal posts and cable end with a wirebrush?  I have solved many "weird" problems just by cleaning the battery connections.
Eric