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Old 12-09-2017, 01:24 PM   #1
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Jayco Melbourne 24L starter battery discharging

I have a brand new Jayco Sprinter chassis Melbourne 24L. I live in Montana and have taken only one trip this Fall before winterizing the unit and putting it under a cover. It is plugged in to shore power - so it looks like my coach battery is being maintained. However, the so-called starter battery is losing power even though, to my knowledge, all electrical systems in the cab are turned off. To my surprise, after about only 2 weeks I went to start up the engine and the battery was completely dead. So I put a trickle charge (2 amp)on the engine battery & after about 3 days it was fully charged and started up. But then after about another 2 weeks I tried to start up the engine and the battery was completely dead again. My question: has anyone else had this same problem? If so, what's the fix? I'm thinking about leaving the 2AMP trickle charger connected. Is there any danger in doing that? Also, is there any way to charge the starter battery from the shore power? You would think that Jayco would have thought of that??!!
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Old 12-09-2017, 02:32 PM   #2
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We installed a Trik-L-Start which connects the coach charger and batteries to the chassis battery and it provides a maintenance charge.
It was easy enough since our motorhome has a Aux Start circuit and relay in the coach battery bay.

There should be no reason the 2AMP trickle charger cannot be left in place for extended periods.
Some owners would recommend fully charging the battery and disconnecting it, even bringing it indoors in some areas.

There can be many parasitic loads even when the key is turned off in modern vehicles.

The battery could also be on its last leg and perhaps should be taken somewhere and load tested.

Best of luck!
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Old 12-09-2017, 03:04 PM   #3
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Thanks. I think I will try the Trik-L-Start solution.
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Old 12-09-2017, 05:57 PM   #4
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Old 12-09-2017, 07:38 PM   #5
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Welcome to the forum from another Melbourne owner. I use a Battery Tender plugged into the coach and with a 12v cigarette plug I plug it into the 12v outlet under the so called cup holder/ashtray which is always powered. You can also disconnect the starter battery with the disconnect by the accelerator. Here is another post you can read.
https://www.jaycoowners.com/forums/f...rne-42254.html
And here
https://www.jaycoowners.com/forums/f...ies-43448.html
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Old 03-13-2018, 02:31 PM   #6
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I am also having this same battery problem and looking for a good fix. this is our second MB motorhome and we didn't have this problem on our forest river.
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Old 03-13-2018, 03:21 PM   #7
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Install a Trik-L-Start solution and never again worry about it.
A couple of common wrenches and 30 minutes tops!
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Old 03-13-2018, 03:30 PM   #8
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Thanks for the info and I'm checking it out now. We do a lot of dry camping and I'm still wondering if this will work when not plugged into shore power. I did have my Jayco dealer add a second battery in the storage compartment next to the regular one and they feel that should help when dry camping but this didn't help the start battery from going dead
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Old 03-13-2018, 03:57 PM   #9
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It will only work on shore and generator power just as the charger for the coach batteries does.
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Old 03-16-2018, 11:54 AM   #10
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We experienced the same problem. Took the MH to our local Mercedes Sprinter shop since we are still under our original warranty. Mercedes monitored the motor home for over a week and was able to track down the issue in conjunction with a discussion with Jayco. Mercedes noticed a significant draw coming from the wiring under the driver's seat. According to Jayco, "It's a constant battery power from Mercedes we tap for the marker light relay located under the passenger seat and for a park brake relay located under the driver seat. The park brake is used by the dash radio and stabilizer jacks."

The recommendation we got from both Mercedes and Jayco is invest in a battery trickle charger.
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