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Old 04-01-2016, 10:45 AM   #1
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Battery drain

2007 Newmar Kounrty Star
My motor batteries are being drained...will not start coach...always have to jump start...had batteries checked they are good...what can cause the batteries to drain???? HELP!!!! THANKS BILL

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Old 04-01-2016, 11:03 AM   #2
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Assuming you are talking about your engine batteries there are a lot of small loads that are part of the chassis wiring. Over time they will drain the battery bank.

There are a couple of issues to consider. If you are just parked for a long time that is probably your problem. If you are parked and plugged in do you have some kind of maintainer circuit that is not functioning?

Answer those and we can expand our answers.

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Old 04-01-2016, 11:15 AM   #3
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What is the period of time that it takes for the batteries to go dead? If you batteries are good, and by that I mean you've had them tested, they should keep a charge for a long time. If you have a multi meter check to see how much of draw you have.

Good luck!
Tony & Ruth........... FMCA#F416727
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, Jeep Grand Cherokee Hemi, Blue Ox Aventa LX, and Brake Buddy. TST 507 TPMS
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Old 04-01-2016, 11:51 AM   #4
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I have the same problem on my F53 chasis. The battery drains to dead in a week. It has done it since new. Ford says there is nothing wrong and there is nothing drawing on the battery. It even does it with the chasis and house batteries disconnected via disconnect switches. I have replaced the starting battery and it still does it. I gave up after 3 years and now just hook up a Battery Tender when I park for more than a couple days.
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Old 04-05-2016, 10:37 PM   #5
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I've had this problem with 3 of my 4 moho's. chevy and dodge. I found that there is usually a radio with an electronic memory hooked up to the engine battery. I put a switch on the clock and main power wires. Problem solved. Remember that most modern radios use juice to maintain the presets button as well as the clock. Lastly I'd check to make sure that your coach battery has it's own ground and is clean as that will drain the starting battery if it gets corroded. The coach batt will use the ground from the start battery to operate.
May your black water hose never break!
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