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Old 08-06-2021, 09:26 AM   #1
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Chassis battery

Hi all, I have a 2009 Fleetwood bounder and the chassis battery is slowly discharging while I am on sure power. The house battery voltages are staying up. Chassis battery has dropped from 12.6 to 12.2 in the last couple of weeks. The chassis battery is brand new. The inverter/charger has always kept both the House and chassis batteries up around 13.3 VDC with no problems until now.
If anyone has any idea as to what the problem may be or how I can fix it please let me know.
Thanks Jim
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Old 08-06-2021, 01:05 PM   #2
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Location: North America somewhere
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There should be a relay to handle chassis battery charging on shore power which seems not to be working.
A short-term workaround is to use a set of light jumper cables between battery banks while on shore power.
Next is to find the parasitic draw on the chassis battery, it should remain charged for months without recharging.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 08-06-2021, 01:13 PM   #3
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First step is to check your float charge voltage. It needs to be over 13.4 volts on the house batteries before a charge is sent to the chassis battery.
If lower then that, check what the battery temp sender is showing. You can just unplug it ( BTS on inverter ) also to test. Default is 77 degrees.

If all is well, Push the boost switch on and off while listening for the clunk.

That solenoid is most likely bad, be sure to replace with a contiounus duty type.
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battery, chassis

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