no crank

So my 2018 JL with 105k miles just began giving me issues. I was having intermittent starting issues. Found the starter covered in oil from a cracked oil filter housing. Replaced housing and starter. Continued having intermittent issues, no codes stored. Replaced both batteries and the batteries...

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...