That's the first thing I checked. One DF is almost new. No corrosion.

Have a Minnkota 315D onboard that stays hooked up to all 3 batteries.........but not plugged in of course, unless I'm in the garage. Not sure what that matters.

I have changed nothing............and everything worked fine for years. Now this. Something has gone wrong, something has changed. I have not reconnected anything differently.

Just re-read Ed's........the battery connections in the battery compartment have not been checked. That was my next step. It's possible something is loose or corroded THERE. I'll look at that in the morning............