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I have a new MZB chassis 24' motor home. The starter battery…

Customer Question
I have a new...

I have a new MZB chassis 24' motor home. The starter battery went dead after sitting for 10 days with all lights, etc. off. A new battery was installed and the same thing has happened 3 more times.

Mechanic's Assistant: Did you test the battery with a voltmeter? And have you ever changed one before?

The battery was replaced by Alfano MZB service in San Luis Obispo. I have not tested with a voltmeter.

Mechanic's Assistant: What is the model of your '10 Mercedes?

It is a 2018 3500 diesel Sprinter chassis Forest River 24' motorhome

Mechanic's Assistant: Are you fixing your Sprinter yourself? What have you tried so far?

The motorhome is one month old. I am trying to get the RV dealer to accept responsibility. Alfano Mercedes in San Luis Obispo says that it's Sprinter service dept. is "backed up over 3 weeks." As far as I am concerned that type of service befits Yugos and not Mercedes.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I have trickle charged the starter battery several times. I believe that the automatic RV steps are connected into the starter battery since they do not work when the battery is depleted.

Submitted: 7 months ago.Category: RV
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Answered in 3 hours by:
11/30/2017
RV Mechanic: Randall, RVIA Certification replied 7 months ago
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 14,251
Experience: RVDA/RVIA Master Certified Technician with many years experience.
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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

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RV Mechanic: Randall, RVIA Certification replied 7 months ago

There may be a parasitic drain there and that can be tracked down. Are you hitting the battery disconnect solenoid switch when you aren't using it? That would prevent this from happening to a large extent. I am surprised that they didn't run some tests here to determine if this was happening or not. This isn't that hard to test most of the time. Are they using a quality battery here or some cheapie brand? Get back to me with this information and I can offer more here. All follow ups are included in our fee. No time limit.

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Customer reply replied 7 months ago
The original battery came with the brand new Mercedes chassis based motorhome. The replacement battery was installed at a Mercedes Sprinter service center. I am not aware of a battery disconnect solenoid switch. Where is it on my 2018 3500 Sprinter dash? The battery drain was supposedly checked by a second Mercedes Sprinter service center in Oxnard, Ca. They apparently did not find a drain. Obviously there is a drain.
RV Mechanic: Randall, RVIA Certification replied 7 months ago

I don't know what quality battery they install in these. Even a small drain can totally discharge your battery over a week or so. Sometimes it is just the radio being on even though the switch is off. Most still keep time and that takes power. It may have the LP detector wired into that battery and not the house battery. Those are always on. The battery disconnects should be right next to each other. Rocker style momentary switches that return to their original position when you let go of them. They can be on the dash, but are usually near the entry door to the cabin. On the end of the counter as you come up the stairs is a favorite place or on the overhead over the door or next to it. Usually some other switches nearby. Not sure where Forest River put them in yours. Take a look around and see if you can spot them. You should hear a distinct "click" when you engage them. Some have a red light next to them showing when the batteries are "in the loop" so you know. Hope that proves helpful here.

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RV Mechanic: Randall, RVIA Certification replied 7 months ago

J​ust following up to see if perhaps you missed my earlier responses to your question? Easy to do considering the volume of e-mail that most of us get every day! If you need me to resend it please let know. Thanks!

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