Here’s where I’m at. I think it’s solved. Somewhat embarrassing but it is what it is.
Load tested the battery and it gave me 13v static and then dropped to 10.2 when the starter was cranking and then went to 12.2 while the pickup was running which means the alternator was not feeding the battery. I then realized that the serpentine belt wasn’t tight and was therefore not spinning the alternator or anything else.
I had to take off the big plastic air intake and a plastic cowl to access the alternator when I replaced it. The tensioner on the serpentine belt is just a spring loaded arm with a pulley on it that you put a half inch breaker bar on and pull it over to relieve the tension and when I replaced the alternator something evidently bound up in the spring mechanism causing the tensioner to not apply adequate tension. I fiddled with the tensioner for a minute and it seams to be working adequately for now.
Started it up again and now was reading 14.5 volts when running so I think we’re ok. Simple and easy but it just wasn’t exactly obvious to me in the dark the other night beneath the air intake and cowling that the belt wasn’t actually spinning.
Off to the auto parts store to grab another serpentine belt but at least I’m not out a battery?