DC to DC charger

All in all, life is better with Lithium Iron batteries. Better still with a dc to dc charger. Disconnect the 7 pin power wire from charging your batteries, it is no longer needed and may cause a feedback loop. Your dc to dc charger will be feeding a higher voltage back to the alternator and computer through that wire if left connected and you don't want that, weird stuff can happen. Right now, I'm in the TC with my 400 AH batteries at 80% charge because there was no sun to speak of today to charge them. Tomorrow I'll go for a drive and my 30 amp dc to dc charger will give them a good charge back up in an hours time. Enough to get a nice bacon cheese burger and walk along the beach. My 675 watts of solar on the roof and the MPPT Victron history shows I got a peak of 53 watts for a couple hours today. The redundancy of the 30 amp dc to dc charger is so nice to have. My 10 year old BoonDocker 45 amp shore power supply has something wrong with it and is only putting out 4 amps. I'm going to replace it with a Victron 3000 watt inverter power supply when I get down to Quartzite. The best thing about Lithium is they always put out 13.2 volts thanks to the BMS. Lead batteries, all types, slowly drop voltage as they discharge causing brown out conditions like dim lights, slow pump motors, and weak other loads. Not so with Lithium. 13.2 volts stable all the way down to 80 or 90% discharge and then the BMS protection shuts it off till recharged. Lithium is like having your cake and eating it too.