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Auxiliary Battery not charging
- Thread starter Pomeroy
- Start date
Steve B
Active Member
I'm sure there are more knowledgeable people on here with battery technology, but if your fridge, usb's and kitchen floor lights are working when the engine is running or on hook up then it could be your battery. The lifespan can be just 4 to 5 years, but often longer. Try hook up charging and check the voltage afterwards, if its 12.4 or below its probably the battery. Mine is nearly 6 years old and still OK, but the MP is a daily driver so gets constant charge
Hello! I had a battery charging problem that I discovered on my 2021 MP with easy up roof and automatic door.
The auxiliar battery monitor only camping utilities while engine battery is used for door and roof bed.
I changed my 3 year old engine battery because 3 times in 4 month the engine couldn"t start.
But it didn't help. So at the Van Pro Center of Brugge Belgium, they launch a new version of the MBAC and a electronic link between the 2 batteries (under MB warranty) and now everything is OK.
3 hours time is enough to charge 100% from 40% the additional battery with external electric cable.
Good luck
The auxiliar battery monitor only camping utilities while engine battery is used for door and roof bed.
I changed my 3 year old engine battery because 3 times in 4 month the engine couldn"t start.
But it didn't help. So at the Van Pro Center of Brugge Belgium, they launch a new version of the MBAC and a electronic link between the 2 batteries (under MB warranty) and now everything is OK.
3 hours time is enough to charge 100% from 40% the additional battery with external electric cable.
Good luck
I had this issue and by stopping turning the stop start off rectified it. The battery will start charging when the yellow ‘A’ on the dash turns to green.
Loads of other possibilities but this worked for me