battery issues

HERES MY SITUATION: I’m stomped here, in my 18 Wrangler JLU, V6 3.6L, I had to change out the main battery cause the AUX battery killed it, I was hoping the main battery would charge the AUX battery, but the AUX Battery killed my main battery again, I put in a new AUX battery and charged the the...

I know there have been a bunch of issues posted about the etorque engine. I have a 2019 unlimited with the 2.0 turbo etorque. I bought it used with about 10k miles on it and have put another 10k on. I bought it with the modifications made by the previous owner, who was really the second owner...