I fought the discharged battery fight for years with my trailer winch. Finally threw in the towel. Got one of those high amperage disconnects and ran a positive copper lead all the way to the truck batteries (Cummins) with a charger style clamp. The negative side I got a welding disconnect and bolted it to the hitch for the negative connection. Haven't had a problem since. Can't remember what size cable I used but it was around a 1/0.

Do be aware that the batteries may take a charge and appear good but they may fail when a load is placed on them. This is an issue that has been becoming commonplace recently, purportedly due to cost cutting by the battery MFR's. Verify all your grounds and connections are good. If the battery is bad and the voltage drops the current draw will go up which may be tripping a thermal breaker in the motor. Charge the battery and have it load tested keep us posted

Easy. Just say NO to harbor freight/ problem solved

Get a 30 day war.from junkyard.just take a meter if it ain't 12.5 don't get it
Also cca bigger better

I've had a few that say 12.4 all day long till you hit the starter the then drop like a rock. Strangely enough some walk right back up to 12.4 First time I experienced it I chased my tail for 2 days until I happened to be watching the DVM when I hit the remote start switch. In over 50 years I had never seen this happen. But have seen it several times since and read about it as well

Agree I had batteries that charge 13.plus until hit key then drop to 0 when hitting starter.on those the welder trick works sometimes