I'll call in the replacement warranty on my alternator to eliminate that though.

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Just wonder about what the buyer think when they accidently read this thread.

 

The alternator could be going weaker as it gets hot...

Change the alternator, disconnect that battery for a few minutes and hook everything back up and see where you are at with the codes.

How many miles are on the jeep total?

One thing you can go to next is the fuel pump. Mine when out at about 93K, caused all sorts of weird stuff to happen including getting a mis-fire code.

Here is my thread thread on that.

 

https://www.jk-forum.com/forums/stoc...change-288924/

 

So I got home today and did some checking. I took a rubber mallet to each cat. The passenger side top one has a big chunk of something bouncing around in it when I hit it. I am leaning towards that one being the cause of the problems. I have 127,000 miles on the cats. They have been through 2 bad motors. The last one that I replaced 2 weeks ago was burning oil at a tremendous rate along with a lot of fuel being burned up or sent through without being burnt. I would imagine this was some of the cause of the cat going bad.

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I got a code of P0430 the other day which is a catalyst code, and also got a P0420 today.

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Yea I'd say you are on the right track with the CATs.

You always want to start with with the obvious possibilities first. Being you have confirmed the voltage from the battery is solid and the alternator is doing its thing, moving on to the cats would be logical.

 

Holy crap man! Did I understand correctly? 2 motors in 127k miles???

 

Yep....2. One at 30k miles by Chrysler under warranty for the previous owner and one by me 90k miles later.

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Is the motor really new? The reason i ask is it might be a good idea to check that all the wires are firmly connected.