khutton

No Battery Power

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khutton   

I drive a 2004 Damon Challenger 34 foot, gas class A. After driving home from AZ with no problems, I parked the rig for 3 weeks. Now, both the 2 coach and 1 engine batteries are death. I often park the unit for 6 to 8 weeks and have never had a problem with the battery power. Also, I had the battery disconnect switch on so not sure how anything could be drawing power. I have not yet tried to jump the engine battery or checked the batteries water level. The batteries were checked and water levels ok in January. Any suggestions before I go looking for the problem?

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wolfe10   

khutton,

Welcome to the FMCA Forum.

6-8 weeks with any parasitic draw will assuredly discharge batteries. 

I would recommend two things:

Fully charge the batteries and have them load tested (free at any place that sells batteries).  Make sure they are fully charged first.

Then, use an ammeter to check for draw with the salesman switch OFF (actually any battery disconnect switch turned to OFF).  On many coaches there are still things that remain "on" even with switches off.  Things like PC board for refrigerator, propane detectors, radio memory, etc.

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khutton   

Wolfe 10,

Will items still draw the coach power with the disconnect switch ON and will that draw from the coach normally draw power from the engine battery too?

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If the disconnect switch is 'on' then your battery is connected and power is being used.

Power may be drawn from the engine battery as well if you have a 'battery bridge' (something designed to join the house/engine batteries for charging and/or starting with a weak battery).

Do you have a manual for your coach? Perhaps there is information in the manual which would help figure this out?

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wolfe10   

And, even without a battery "'combine" switch being on, there are parasitic loads on the chassis batter. Certainly, the engine ECU and likely the radio memory are normally on the chassis battery.

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5 hours ago, khutton said:

had the battery disconnect switch on so

Not sure if this is a typo, or an actual statement, ON is not the correct position for a battery disconnect switch for long period parking, that switch should be in the OFF position to not allow drainage of your batteries. And as stated by others, there usually is some parasitic draw even in that position. You also state that it is not uncommon for your coach to sit 6 to 8 weeks without the batteries draining, is it possible that you normally plug into an electric source, and this time you didn't?

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If you plan to leave the coach parked and not plugged in, it might be worth it to have manual on/off switches installed immediately next to the batteries (before any loads are connected) so that you can fully and totally shut things off. This will make it much easier to avoid problems. Or course, then you'll need to reset things like radio memory unless your radio is a newer one that retains settings without power. Not sure what else will need to be reset on a newer rig, so best to check your manual on that.

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khutton,

When you have your coach stored for 4 to 6 weeks is it stored with power plugged in? If so then your inverter was helping keep everything charged.

The best way to insure that the gremlins don't drawdown you power when stored for a long time is to disconnect your battery cables. If both the house and the chassis battery are fully charged and the negative cables are off you should be OK. 

Herman

 

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khutton   

Thanks everyone for the info. My coach battery switch is marked connect and disconnect. I think disconnect turns the power off but now I am confused. Either way, before I leave the coach parked I turn the light switch on just to check the switch and if the lights don't go on, then I know the switch is set correctly.

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