And now for the rest of the story:
Before pulling the trigger on Lithium batteries and solar charge controller, I decided to check my existing lead acid golf cart batteries. One pair was dated 1/2017 and the other pair was dated 10/2018, so I was sure they were no good.
I disconnected all of the wiring, and checked each cell with a hydrometer...all tested fine. Did a load test on each battery....all tested OK. Charged each battery with a charger that has a desulfation cycle. Cleaned all the terminals and hooked everything back up.
Maybe next Black Friday will be my time for Lithium. No reason to spend that money now.
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'05 F250 6.0 Bullet Proofed - Sold
'17 F350 6.7 Lariet
'02 Montana 3280RL Upgraded a bunch.
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