When battery voltage is down, smart alternator goes to work at it's job of charging..... so you see smart alternator output of 14, 14.1, 14.5, etc.. Once battery voltage is up, smart alternator can take a break so to speak and you see smart alternator output of 13.2. 13.5, etc..
Many like to take the short way out by pulling fuses and negative cables. Aux battery is the corporate. Too too many codes and battery problems. Yet so many never remove it. Completely eliminate it. It was a horrible engineering design that flopped. Nevertheless FCA never recalled the problem that almost all eventually face.
I continued to dig on this issue and stubbled across this thread"
Ah ok, I removed the negative and fuse but I'm still getting the exact same dash errors - aux switches and ESS not available. Does it require pulling the battery entirely to rid yourself of the error messages?Many like to take the short way out by pulling fuses and negative cables. Aux battery is the corporate. Too too many codes and battery problems. Yet so many never remove it. Completely eliminate it. It was a horrible engineering design that flopped. Nevertheless FCA never recalled the problem that almost all eventually face.
I stuck with the original H7 battery no issues. Completely eliminated the Aux, works fine (over 10k to date.) But had countless others before. left me stranded, flat bedding to the dealership. No More.
Good luck
Why leave it?
From reading this thread, it seemed like the desired effect could be achieved by leaving it in place and frankly, saving me from removing the fuse box. That, and I needed to do something quickly before parasitic drain on the main might leave me stranded. I'm hoping maybe just clearing codes can rid me of the error messages that no longer apply since the battery is now disabled.
Makes sense, its 4 years old, though the Autozone people told me it's totally fine just this week. Probably best to replace it by now.
