Appreciate the concern, I'll ignore the incorrect assumptions. I'll have them test it at the RV dealership as well as when I take it into Mercedes next month for it's service. Could be a defective battery - or a small draw even with disconnects. I remember when I first got this MH, very cold start one morning and it ran like my old Kubota used to until it warmed up in sub zero temps. And a few times since, when in storage for a few weeks it ran rough for a few minutes even in warm temps. Considered it more of a diesel problem than a battery problem. Frankly I don't really care for the Sprinter Chassis. It rides nice, but it's a little anemic on power when towing and does some weird electrical stuff periodically - alerts for no reason while driving etc. .
I would just pull the battery, charge it and then take it and get it load tested. fast easy and lets you know right away if it is the battery or not. if the battery is fine then you can then look for a drain. no it should not go dead in two weeks, we all my vehicles have sat for at least 2 months at some point during the winter and not one has had an issue starting, and we have real winters 😉
seriously though a pep boys or what ever I think you guys have down ther should do load tests for free, if you were closer I have a load tester and would do it for ya, but I'm not so that doesnt work.
Agreed. I think you and Grit have a good point that there is more draw than supposed to even with the disconnect.
I will have the dealership check it when I take it next week. The challenge with the MBS chassis is that the battery is under the floor pan between the front seats. Requires removing the floor covering, then removing a panel etc. Not impossible, but a huge PITA. I swear German cars make things way more complicated than they need to be. It's been starting fine when I have it here at the house as we prep for a trip and if it does get low, a 15 min drive brings it back and it's fine. It's just the sitting for more than 2 weeks that seems to draw it down. So I think the battery is fine, it's some parasitic draw in storage. I may end up installing my own disconnect switch on the chassis battery so I can ensure nothing draws on it.
ram did that, you have to pull a panel at the drivers seat.. so not just german..
