WELL I GUESS The title says it all.One passenger side battery has already exploded and I get the feeling ots going to happen again if not corrected. So what would upur diagnosis be?The drivers side battery charges at 12.8v peaking at 13.3 perfect.. now go over to the passenger side battery and I get an insane 18+ volts..
What is going on here? Is this an alternator issue or something else?
Thanks for your time iy is appreciated

 

Do you have a battery isolator? Do you have more than one alternator?