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Old 07-02-2018, 12:13 PM   #1
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Dead Batteries on 2018 Melbourne 24L

Our new Melbourne has been plugged into electricity for about a month. Just tried to start the motor and battery is dead. After checking, both batteries are dead. Any ideas?? Thanks!
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Old 07-02-2018, 03:50 PM   #2
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Plugging into shore power will not charge the starter battery. Mine will last about 2 weeks speaking from experience. Not sure why your house battery would not charge though. Do you have a volt ohm meter to check if the house is getting any voltage at the battery. Could there be a blown fuse on your charger?
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Old 07-02-2018, 04:04 PM   #3
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To solve the starter battery issue I plug a Battery Tender in at the dinette and plug it into the 12v outlet under the so called cup holders. The outlet in the cupholder is ignition controlled but the one under the cupholders is always hot.
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Old 07-02-2018, 04:23 PM   #4
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Well it turns out it was just a misplaced fuse near driver seat. We had taken one out last week to see what kind we would need for replacement and had put it back in wrong slot. Moved it one slot over and all is well. �� Thank you for your response. Will look under cup holder.
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Old 10-22-2018, 01:17 PM   #5
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I've tried to plug a battery tender into the "hot 12v" outlet under the cup holders in the front dash of our 2017 24K sprinter, and get no connection whatsoever ever. I just get blinking amber light forever. Then I hooked up the tender directly to the battery with the alligator clips and allowed the battery to fully charge (with the steady green light showing). Then I retried the cigarette lighter adapter into the 12v plug under the cup holder to see if, now that the battery is fully charged, it shows any sign of life. Still not a connection. So, did Mercedes change things and this is no longer a hot connection, or am I doing something wrong in not getting connection. I'd like to use the adapter in the 12v outlet rather than go through the drill of accessing the main battery.
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Old 10-22-2018, 04:55 PM   #6
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Does that outlet work otherwise? Could be the fuse. As far as I know things haven't changed.
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Old 10-22-2018, 05:08 PM   #7
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I just checked the 2017 Sprinter owners manual (page 206) and it is still hot with the key out of the ignition. If yours is on a 2016 chassis it should be the same. So I would check the fuse.
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Old 10-23-2018, 08:56 AM   #8
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Thank you Pfflyer. I'm going to check today with some other gadget I found that works off a 12v outlet, then check the fuse. I'll let you know.
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Old 10-23-2018, 05:09 PM   #9
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Pfflyer - I've checked the 12v plug under the cup holder - it is hot when the key is out. So, I checked the adapter (the only thing left as the possible problem) and took it apart to find the fuse was blown. I think it may have blown because they have a 3amp fuse in a 5 amp adapter. I'll replace it with a 5 amp fuse (assuming I can find it easily) and try again.
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Old 10-23-2018, 05:21 PM   #10
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PF: let me see if I got this right...you plugged the electrical cord for the battery tender in the 12v outlet under the dinette and then plugged the cigarette lighter adapter into the socket under the cupholders?
That keeps the chassis battery charged by pulling juice off the coach battery?
How do you keep the coach batter charged?
I've got an extension cord ran to the rig with a battery tender on the coach battery and a second trickle charger on the chassis battery. It works but's it's a pain.
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