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Old 12-08-2019, 02:52 PM   #1
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Batteries not charging

Hello I have a 2006 Damon Challenger and while plugged in my house and chassis batteries no longer charge. They are both dead now and I have DC power while plugged in. I'm thinking my converter is working because I have DC. Could this be a relay problem not sure where to begin troubleshooting at can anyone help with this.

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Old 12-08-2019, 03:13 PM   #2
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Is your battery disconnect on? Also, some coaches will charge the chassis battery from shore power, some will not.

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Old 12-08-2019, 03:20 PM   #3
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First, I'm not familiar with the specifics of your coach's electrical system. However, many coaches have similar electrical system strategies.

Many coaches DO have isolation relays that keep the chassis batteries from powering the house electrical system. Those relays are designed to allow the house charging system charge the chassis batteries. It's relatively common for those relays to fail in such a way that the house charging system can't charge the chassis batteries.

How's the voltage on the house batteries? IF you can check the voltage on the house side and it's above, typically, 12.6v, the charger IS working.

Most coaches also have some sort of chassis battery boost capability that allows you to connect the house batteries to the chassis batteries by using a momentary (typically spring loaded) switch in the cockpit. HOLDING that switch in the "boost" position will use a different relay to allow power to flow from the house to the chassis batteries. If you can locate that switch and activate it for a period of time (30 seconds or more), it's possible that you can get your engine started.

I know I'm not much help by offering just general suggestions. Sorry. Hopefully someone with suggestions specific to your coach will be along soon.

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Old 12-08-2019, 04:07 PM   #4
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Here is a basic layout of relays in most MHs.

Your problem is between the converter and house battery. If the house battery don't charge, it won't let the chassis battery charge.

Look for a fuse near the battery and check for current flow thru the house battery disconnect solenoid ( relay ). A simple jumper is used to by-pass it as a test.

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Old 12-08-2019, 08:35 PM   #5
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Thanks for the suggestions the diagram will help in troubleshooting we'll make some checks and see what I find.
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Old 12-09-2019, 07:10 AM   #6
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Also check for a tripped breaker on your inverter/charger. This, too, is a common cause for house batteries not to charge.

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Old 12-13-2019, 09:41 PM   #7
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Originally Posted by BCarp View Post
Is your battery disconnect on? Also, some coaches will charge the chassis battery from shore power, some will not.
Found the wife had hit the switch for the battery disconnect and the coach and chassis batteries had discharged. Charging them now but will be looking for what's discharging them thanks for the comments.

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