Best way to charge a third battey (1 Viewer)

[Manuel4x4]

Hi guys! I have a diesel 200 series... it has 2 oem batterys connected in series. I have a trailer with 2 100amp batteries and I would like to charge them with the car, which would be the best alternative? I've read that an isolator doesn´t work properly with these alternators... but I have my doubts, someone have done it before?
Thanks!!

 

[TeCKis300]

DC-DC charger. It'll provide the charge profile that's best for your trailer batteries. Overcome resistance and voltage loss for the long run. Provide stead charging. And isolation.

 

[daneo]

We had a long chat on this a couple weeks back if someone can dig it up.

Don’t forget to use quality connectors and keep them clean!