Battery is new, alt is new. I am going look for an ammeter to borrow tomorrow night.
So you obviously have an abnormal parasitic load (draw).
My Jeep has a slow drain on the battery so I simply bought a 2 piece brass connector to go on the -terminal. when I decide to take the Jeep, I simply open the hood and twist the knob to close the gap and start the Jeep.
When done driving for the day I unscrew the knob, open the gap and get no battery drain.
If I had to do this daily it would get to be a problem but I don’t take the Jeep out but maybe once a week or month.
I saw your thread and the many different opinions and didn’t have anything to contribute as there ‘was’ help in there.
However, on the drive home today i recalled something. Useful or not, it’s somewhat pertinent:
About 15 years ago I was at a parts store picking up a few items for what I was fixing. I was in there quite a while, long enough to have heard this guy buy & bring back in for return THREE different batteries for his Jeep. The auto parts guys were no help at all with their little ‘tester’. Batteries tested good, yet they kept feeding him batteries.
I cashed out and walked outside, asking him if he’d like some ‘real’ help. He pleaded with me to help.
He had been having some slow starting issues (sounded like drained battery), managed to get it started to drive to the parts store, but no battery he put in it would start it. He told me earlier in the day he’d done the alternator already.
I didn’t even have him turn the key. I asked for a screwdriver, scored the inside of the battery terminal clamps on the cables, popped em back on with a pound of my fist and had him turn the key: Voila.
Lead eventually forms an oxidized coating (a dielectric) that prevents electrical connection, no matter how tight the terminals are clamped.
It was the worst case of oxidized cable clamps I’ve ever seen (the symptom, not their appearance), but to an inexperienced eye they looked perfect and SHOULD have worked.
Just saying don’t overlook the simple. Just because an electrical connection is solid, doesn’t mean it’s a good one, especially on an older car that’s parked outside, particularly a vehicle near coastal areas (that goes for grounds, too). Hopefully you have a similar problem or a simple hidden compartment light, and not an intermittent short. Assuming it’s not as I described above you’ll likely find the issue with the ammeter & pulling fuses.
Good luck.