Aux Battery is OK, what else could cause "Start/Stop not Ready, Battery Charging?

[Zimbu]

How often do you drive it and for how long each time?

Mine did that as the batteries aged. Once I recharged each independently with a good AGM charger and reset the IBS - it worked a lot better. But - lack of driving made it start to go back to the old ways.

How often do you drive it and for how long each time?

Mine did that as the batteries aged. Once I recharged each independently with a good AGM charger and reset the IBS - it worked a lot better. But - lack of driving made it start to go back to the old ways.

I drive it almost every day . 120 + highway miles .

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[Lost1wing]

I have a 2023 Gladiator and had no battery problems for almost 2 years and then it wouldn't start . Jumped it off and things looked okay but then the voltage started fluctuating up and down between 12+ and 14+ VDC . Called dealer and took it in and they replace both batteries . Drove home and it kinda looked okay . It sat for a day and after starting it came up to 13.0 and stayed there until i had to slow down for a stop light once i pushed on the brake pedal it went up to 14+ and then back down to 13.0 . I drove it approx 50 miles and stopped and started 3 times all with the same results . Any ideas ?

You most likely had an issue long before the no start. Could be it sat for a time at the dealer and maybe even jump started a few times. That is water under the bridge now that the dealer replaced both batteries and I assume they did it the proper way.

Your electric powersteering demands power, so I can see the momentary increase of voltage. I would concentrate on what the ESS page has to say more than the voltage readings. If ESS is "Ready", the computer is satisfied with your battery status. If it says " not ready" or battery charging for long periods of time, then you can pay attention to the battery voltage. The time you would want to look is before starting the engine for the first time that day. Once the engine is running, you are not looking at battery voltage any longer. Whether the alternator is charging the battery, cooling the engine, turning the electric brake pump or any other accessory, will affect the reading you see on the display.

Back in the day, you either saw battery voltage or alternator output. Back then alternator output had a voltage regulator that maintained approx 14 volts. Now the computer has a say on alternator output. Voltage will vary.

Edit, after having my coffee I realized I mentioned electric brakes. Wrong vehicle, sorry for the confusion. Powersteering is what I was thinking but My mind just wondered.