First, the facts:
engine starts right up, so long as it turns over. It will start when barely turning over, even after an attempt when it doesn’t turn over, so this is not an engine issue
batteries (4) are whatever the seller had laying around, 925, 650, 950, 825 A
two batteries showed bad with cheapo tester at rated amps, but showed good at 750a
my tester would not test one battery, would just restart the menu when attempted
Truck starts after sitting in shop on charger
charger says all batteries are 97% individually, and 87% when connected to all
truck doesn’t like to start after sitting out for several days not connected, cranks slowly or not at all
replaced voltage regulator, get 14 v when driving now
starts ok after driving
my conclusions:
i have a drain somewhere- i can fix that, or disconnect batteries
batteries are not great
best case would just be to buy all new batteries, or better yet, all new truck, but would prefer to understand the issues at play here
my questions
will batteries work ok in a group if they are different ratings?
will a higher amp not great battery pull the others down even if it tests ok at lower amperage ?
what kind of amps do i need for a s60 12.7 to start?
Thank you for your patience and assistance.