URGENT HELP NEEDED!!! Leaving tonight.
We replaced our stock 2017 Sprinter AMG auxiliary battery with one - 100Ah Battleborn battery. The Orion DC-DC 12/12 -30 isolated charger is not charging the Battleborn. (It charges just fine from shore power.)
Read somewhere here to disable the smart alternator, did that. Selected "Regular".
Our Sprinter had a cutoff relay E36, we bypassed it, thinking it was the problem. Did not help.
The starting battery's voltage shows 14.16V when the van is running. Not sure why the input voltage shows as 13.8V. Wire size is AWG6.
Please send troubleshooting suggestions. I can post extra pictures if needed.