Wife and I just got to the drive-in. Shut down, and when I turned ignition to accessory, the gauges started bouncing around and it won't start. I have disconnected the battery for now, but don't know how to proceed. What say the gurus?
I've read all of the scuttlebutt about the Optimas, but I wasn't going to fix it until it broke. And, after 4 years, mine for two of them, it broke. ¯\_(ツ)_/¯I don't think you mentioned that you had an Optima.
Forget trying to bring it back to life. It will be an exercise in futility. I've done it with a 40 amp jolt and then a few charge/discharge cycles in an effort at desulfation, but in the end an old Optima that has failed in the manner yours has will never be the same and should be replaced so that you don't chance relying upon it offroad.
You won't get many (if any) positive comments about Optimas on this forum. If you want a conventional lead acid battery as a replacement, try the Costco Interstate Group 34 for about $90. If you want another AGM, you may want to consider the Duracell AGM, Duralast Platinum AGM from Autozone, Super Start Platinum/Super Start Marine AGM from OReilly's or the Napa Legend AGM from NAPA - all are private labeled made in USA batteries from East Penn/Deka and all identical to the highly regarded Deka Intimidator AGM and in the $160-170 range rather than the $300 rarified air of Northstar/Odyssey AGM batteries.
You might find this article useful:
https://www.roundforge.com/articles/how-tell-if-your-optima-battery-bad/