2021 Jeep Gladiator - Start / Stop - Replace Both Batteries - Sequence ?

[Sean_Gladiator_JT]

Pulled both batteries - Main and Aux.
Bought two new batteries (AGM). Installed and still got the start / stop icon on the dash.
Removed both batteries completely.
Bought a digital battery tester and a NOCO 10 Battery Charger.
Both batteries charged to 100% Green Light on the charger.
Digital Battery Tester had them both as well at 100% and 12.82 and 12.73 (Aux).
Also checked the tan 5amp #3 IBS fuse which was good.

Pulled the IBS Sensor completely off, disconnected from both grounds and disconnected from the sensor feedback for 30 minutes.

1. Question is - sequence to re-connect everything?

Aux Battery, Positive, then Negative.
Main Battery, Positive, then Negative (after reconnecting the IBS Sensor to the sensor control and grounds).

2. (Speculative) - If that does not work - is there any other way to test if one of the PDC High Voltage Fuses blew (ie....anything else that would not work on the jeep or come on)? Asking as it is the only other thing mentioned to check on several other threads, I can replace it but would rather verify it's broken first if at all possible.
If that does not work am I off to the dealership after replacing the PDC High Voltage Fuses?

Thank you

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[jac04]

1. Question is - sequence to re-connect everything?

Below is the procedure from the FSM that applies after disconnecting/isolating both battery negative cables. So, the procedure below starts with both positive battery cables connected.

 

[Sean_Gladiator_JT]

Followed the above re-connect.

Started the jeep - same issue - Auto Start / Stop not available......

Any thoughts what else to check? How do I check the PDC High Voltage Fuse? (Everything else in the jeep is running normally).

Any ideas on dealership diagnostic cost?

 

[jac04]

The IBS needs to re-learn the battery SOC. This can take some 'cycles' and things like the ESS may not work until it upates.

Again, from the FSM:

 

[Idlethunder]

I replaced both batteries on my 22 model this afternoon without trouble. What I did was disconnect, separate, and tape off everything on the main neg first then did the same on positive. I then went in thru the wheel well and removed negative first then positive on aux battery. Installing the new batteries was a reverse of that. The only thing I did differently from your original post #1 was I put the negative terminal back on first then reconnected everything to it while attached to the new battery. After reconnecting everything, the jeep started right up and all the dash errors are gone. The start/stop also functioned fine both times I’ve driven it this evening.

Yesterday was my first sign of trouble. Got in to go to work and it wouldn’t start, wouldn’t even crank. Put my charger on it for half an hour but still nothing. I then had a friend come out with a big jump box and it started but had dash errors and start / stop not available. I still have a few weeks warranty left but rather than wait until after Christmas to get it looked at, I bought new batteries from Oreilly’s yesterday. I also charged both and immediately after installation everything worked. That came as a surprise because every other time I’ve had the main negatives separated, it took a while for some of the controls built into the stereo to come back online. Today everything worked immediately. The only thing I found that changed is that the display theme went back to default.

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