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Old 01-26-2022, 12:18 PM   #1
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Battery Draining While on Shore Power

I've had my 2000 Holiday Rambler Endeavor MH 38CDS diesel plugged into 50 amp shore power at my home the last 2 months, and when I tried to start it, I had to use the AUX power (house battery) because the engine batteries could barely crank the engine over.

Doesn't the 50 amp plug charge the engine batteries? Or does it just charge the house batteries? I could switch the engine batteries off while it's sitting but I'd like to understand if this is really necessary.

Thanks for any explanations. I'm still kinda new at this.
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Old 01-26-2022, 12:35 PM   #2
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For some reason some models of Monaco/HR coaches don’t charge the chassis battery when plugged in. I installed a Trik-L-Start which will take care of the prob.

Mega TRIK-L-START Starting Battery Charger/Maintainer

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Old 01-26-2022, 12:36 PM   #3
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Sounds like the B.I.R.D. is bad
*(BI-DIRECTIONAL ISOLATOR RELAY DELAY)

Allows charging of chassis battery while connected to shore power
https://intellitec.com/wp-content/up...-00362-100.pdf
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Old 01-26-2022, 12:55 PM   #4
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The Trickle Start mentioned above is an option, but the Amp-L-Start can transfer 15 amps. I currently use the Magnum SBC (smart battery combiner) which can transfer 25 amps. While plugged into shore power, both chassis and house batteries are @13.48 volts.

https://www.solar-electric.com/me-sb...agnum%20Energy
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Old 01-27-2022, 02:37 PM   #5
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Check the converter / charger.

It could be the AC relay / fuse.

It could be the device itself.
It could be the connections.
(Mine has two outputs, one to the house and one to the chassis.)
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Old 01-27-2022, 04:27 PM   #6
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To charge the chassis batteries you need a separate charger. I use a NoCo genius 5 (a five amp charger) which I permanently mounted and attached. Works very well, starts right up now, no matter how long I've been sitting.
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Old 01-27-2022, 07:19 PM   #7
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Keep your chassis batteries turned off and/or set up a trickle charger as suggested. I keep my chassis batteries off unless I am starting my rig.
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