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Old 12-14-2016, 10:12 AM   #1
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Battery Drain 2017 Melbourne

Ever since we got our unit, the chassis (and house, but that's another story) battery drains after 2-3 days of being parked. We have been vigilant to check EVERYTHING that could be accidentally left on. No glove compartment lights, no dome lights, radio is "off", supposedly. Yet the draining continues. Battery has been checked out to be ok. We suspect it's the Pioneer ACH-x2800bs radio, that came standard on the unit, but wired such that it can be on when the key is removed (since it is the heart of the entertainment system). Even though we use the "Power Off" function, we wonder if it is remaining in some sort of stand-by mode.

I know we could install a battery cut-off switch, but resetting the radio every week, which is how often we take it out, would be a pain, and IMO, shouldn't be necessary.

Have any other Class C owners had this issue and found it to be due to the radio or any other reason?

Thank you!
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Old 12-14-2016, 10:26 AM   #2
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All RVs have parasitic power draws to include such things as CO detectors, powered steps, radios, and other tech features.

If the RV will not be used or powered by shore or generator for an extended period then a full battery disconnect must be used to prevent these parasitic power draws.

We leave ours connected to shore power while in storage and have also installed a Trik-L-Start which allows the built in converter to charge the chassis battery while charging the coach battery.
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Old 12-14-2016, 10:32 AM   #3
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Thank you for your response. I understand parasitic draws exist. However, I think 2-3 days of storage is a short time for the chassis battery to drain. A trickle charger also did not prevent it, thus my question, especially regarding the very short time it takes to drain.
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Old 12-14-2016, 10:43 AM   #4
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Pull the fuse for the radio and check the results. Many modern chassis' such as the Ford and their designed electronics circuits for ECM, TCM, and others may be the actual culprit(s).
Although the coach builder will often hot-wire many things to the chassis battery.
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Old 12-14-2016, 10:45 AM   #5
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I forgot to mention that is a Mercedes Sprinter chassis, but could still do the same. I would pull the fuse IF I knew where to find it, but due to lack of documentation on which fuse is which, it would be a testing/guessing game. Would you have any idea on where to find that information?
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Old 12-14-2016, 10:56 AM   #6
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Without a diagram or by contacting Jayco customer service or Mercedes it would be a shot in dark.

Try these Mercedes Sprinter forums, a sister forum of JOF;
http://www.irv2.com/forums/f280/
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Old 12-14-2016, 11:10 AM   #7
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I do not know if this would help, one time I had a similar problem with a car. I removed positive lead from the battery hooked a test light between the positive post of battery and battery positive wire clamp and the if there is a load it will light.Then I pulled each fuse till the light went out.It happened to be a faulty trunk switch keeping the light on when trunk was closed. You may be able to try that pull each fuse removing one at a time when you get to one causing the drain the light will go out.
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Old 12-14-2016, 12:28 PM   #8
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X2 on CHEV57VY's idea.


If you have access to a VOM, use the 10A function to find the culprit. The normal parasitic load of around 100ma may light a 12V test lamp and keep you from finding the real problem.
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Old 12-14-2016, 01:33 PM   #9
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my idea was old school just a suggestion I am sure there might be better ideas out there.
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Old 12-14-2016, 02:17 PM   #10
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Latest twist

Okay, so here's the latest, took the unit to Mercedes after the dealer said they had "repaired" the issue due to "poor battery terminal connections". Mercedes just called and said everything looks good EXCEPT that the battery in the chassis is an AFTERMARKET battery and NOT the Mercedes one that should be in there. So apparently the dealer changed the battery before it was sold to me so now my Mercedes battery warranty is in effect null and void! I will be lodging a formal complaint about this dealer, Richardson's RV in Menifee, by the way. This unit had to be jump started before test driving so they apparently had issues and changed the battery probably for the day I picked it up. Absolutely ridiculous to be caught between a dealer, Jayco, and Mercedes with NO HELP.
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