Did the batteries swap, it was easy, less than 30 minutes. Changed the battery from the 48 to 92r for some extra capacity for the soon to be added electronics. Also plan to upgrade the alternator to the 240 amp that came with the tow/aux switch group.
Decided to change the serpentine belt, what a PIA that turned out to be. I didn't remove the air filter box, only the tubing, should have removed the air filter box
Have to remove something I think is emissions related under the alternator to get to the belt tensioner, it's 1/2 inch extension and a stiff spring without much movement. While you can squeeze your hand behind the air filter box to reach the pulley to remove the belt, it's easier with the air filter box removed. Once the belt is loosened, remove the alternator and bracket to work the belt out. The belt will not come off with the bracket still in place.
13mm, 15mm, 16mm bolts because it would be too fucking easy to use 1 size bolt for the alternator and bracket.
Put the new belt on, have to make sure it's aligned properly between the tension pulley and an idler pulley that is attached to the bracket removed. I installed the new belt and did not keep it held together so when I put the bracket on the belt ended up on the wrong side of the idler pulley. Undo everything, reinstall belt making sure it's between the tension pulley and idler. Tighten everything up, move the tension pulley to get the belt on the outer pulley and too much slack, the damn belt is too long! I can pull the belt off the outer pulley without moving the tensioner.
Pull everything off again, compare belts and it's at about 2 inches too long. This is the belt size listed for the JL and JK's since 2012.
Will need to get the correct belt from the dealer
This shit show took 2.5 hours, then another 30 minutes at the auto parts as the guy tried to find a shorter belt before giving up and refunding.
There is an intelligent battery sensor on one of the negative battery connections, I was told if there is belt slippage, it can cause electrical issues and cause the Jeep to not run or start to protect the battery. I'm wondering if the batteries may have been fine and the issue is belt slippage or the sensor may be faulty. The main battery tested at 11 volts before I replaced it and was having to jump it each day. Time will tell.
I miss older Jeeps, they weren't as comfy and nice inside as todays Jeeps but sure a hell of a lot easier to work on. Too many fucking sensors to have to be aware of and careful with.
I plan to test the battery over the next few weeks to see if the pre-start voltage begins to drop.