How you wired the batteries was one problem and pairing different age/brand batteries could also been a problem.
Suggest you Google "the 12 Volt Side of Life"
It will teach all about the 12v system and properly wiring batteries.
And get a multimeter.
Harbor Freight has coupons for a free one.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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