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Old 10-04-2021, 11:59 AM   #1
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Auxiliary battery malfunction

Hi everyone,
I have a 2021 Navion with a 2019 Mercedes Sprinter chassis that has been in the shop for a auxiliary battery malfunction 3 times and every time I'm told everything is fine with the battery. Has anyone else had this problem? I'm thinking that there may be short somewhere as it happens approximately every 2 months when the rig is left unused for 3-4 weeks. Any responses are greatly appreciated.
Roe
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Old 10-04-2021, 12:07 PM   #2
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We will need a lot more information to even hazard a guess.

Please explain: "Battery malfunction". What is battery voltage?


When it is stored, is there some means of charging the batteries?

Is the battery disconnect switch connected/disconnected?

Assume you have fully charged the batteries and then had them load tested.
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Old 10-04-2021, 12:24 PM   #3
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If the battery is going dead in 3 or 4 weeks, that may be normal.

Get a mechanical battery shut off switch added. The one inside may leave some small things running.
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Old 10-04-2021, 02:21 PM   #4
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Location: Beaver Dam, Wisconsin
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Twinboat has it right. 3 weeks parked is a pretty good length of time for an RV. You should expect 12 volt house power to be gone by then.

RV's frequently come with a disconnect switch near the entry door. Many people turn it "off" and come back in a couple of weeks and find the RV without 12 volt power. Some people call the switch a "salesmen switch" because it is the first thing a salesmen shows them when they first enter the RV.

Not every appliance is connected through the switch. The things still connected slowly deplete the battery.

Storing an RV:

Store connected to shore power or store with the battery disconnected at the terminals. In some RV's the salesmen switch must be "on" when connected to shore power to keep the battery charged.

Lead acid batteries must be stored fully charged for long useful life. Fully charged means 14 to 18 hours on a high quality charger like the one in your RV. It does not mater what the starting state of charge is, it must be charged for a long time. If the battery has been abused, 24 hours or more of charging may be necessary to clean the sulfate off the plates.

Don't forget to check water level after charging flooded cell lead acid batteries. Charging consumes water.

Next, monitor the battery terminal voltage. Recharge 14 hours before the voltage drops below 12.4 volts. Check frequently until you know how long your batteries will last.

Just parked, batteries may last 1 to 3 weeks.
Parked with battery disconnected, may last 6 months.
Parked while connected to shore power may last for years. But, do check terminal voltage at first to verify things are working as planned. RV's are wired in many different ways. Many people have been surprised at how it behaves.

12 volt Side of Life part 1
The 12volt Side of Life (Part 1)

12 volt Side of Life part 2
The 12volt Side of Life Part 2
Some of the information is a little dated, but it is still pretty good.

How does the Lead Acid Battery Work?
https://batteryuniversity.com/articl...d-battery-work

How do battery chargers work
https://batteryuniversity.com/articl...-chargers-work

How to Charge and When to Charge?
https://batteryuniversity.com/articl...when-to-charge

I wish you good luck and happy trails ahead!
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Old 10-13-2021, 01:08 PM   #5
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2019 Mercedes Chassis Batteries

Quote:
Originally Posted by roecallahan View Post
Hi everyone,
I have a 2021 Navion with a 2019 Mercedes Sprinter chassis that has been in the shop for a auxiliary battery malfunction 3 times and every time I'm told everything is fine with the battery. Has anyone else had this problem? I'm thinking that there may be short somewhere as it happens approximately every 2 months when the rig is left unused for 3-4 weeks. Any responses are greatly appreciated.
Roe
Most responses came from a general RV perspective. This is specific to your unit. There are 3 Batteries in your Navion, 1) the Chassis Battery under the Driver's Feet, 2) the House Battery(s) under the step by the door, and 3) the Aux Battery under the driver Seat. Are you still speaking about AUX Battery? The Aux battery is there for the Trans mission and place/keep the vehicle in park and actually should have lasted longer. However during storage you should either power down the electronics from the MBUX display (a temp choice that reactivate next time you press the ignition) or pull the fuse 32(more permanent, but you aren't going anywhere till the fuse is replaced), 10 minutes after vehicle shut down. Then remove the ground connection by the gas pedal. As stated in the manual the Chassis battery needs to be kept at 80%, a good reason for a Trik/Amp-L-Start battery maintainer if you have solar.

Matt Praz
2020 Navion D
2016 Subaru Crosstrek Toad
600 watts solar
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