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Old 09-24-2016, 05:35 PM   #1
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Aux Batteries

2006 Fleetwood Bounder 34F. The display on dash shows no volts for the Aux batteries. When I turn the engine on the AUX Batteries display show fully charged 12 volts. After turning off engine a few seconds I hear a click and the Aux display starts decreasing until show no AUX battery power. The batteries are new and they fire up the generator but once that click happens the volts go down and it shuts off the generator. Anyone have any IDEAS??? Thanks Tom
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Old 09-24-2016, 05:48 PM   #2
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Have you measured the voltage at the battery terminals? Since your generator still starts, even when the dash display says 0 volts, I'd suspect the display, not the batteries. What you describe could just be the charging voltage from the alternator. The two battery groups are usually called the chassis battery(ies) and the house battery(ies). They are electrically separate from each other until a charging voltage (+13.4v) is detected, then the battery groups connect so both can be charged. This is done by a battery isolation relay, it often has a built in delay that doesn't connect as soon as the engine starts or converter/charger is plugged in. It also may delay disconnect when charging current isn't detected anymore.

On your dashboard, is there a battery boost, or emergency start switch that manually connects the two battery groups together, sort of a built in jumper cables? What does the dash meter show when it's pressed and held?

The chassis battery energizes all the functions for driving, wipers, turn signals, dash HVAC, head and tail lights, etc. The house battery powers all the living functions, refrigerator, interior lights, water pump, furnace, water heater, etc.
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Old 09-24-2016, 05:55 PM   #3
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The generator won't start until I turn the engine on before the click.
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Old 09-24-2016, 06:10 PM   #4
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Have you checked that the battery disconnect switch (usually near entrance) is on? It might be labeled 'storage / run' or the like. Do the interior lights, fridge, water pump operate?
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Old 09-24-2016, 06:17 PM   #5
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Yes they all work on shore power. Thanks
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Old 09-24-2016, 06:20 PM   #6
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Originally Posted by psusportsfan View Post
Yes they all work on shore power. Thanks
On shore power, your 12 v is provided by the converter/charger. How about when not plugged in?
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Old 09-24-2016, 06:24 PM   #7
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I have nothing when unplugged. Until I turn the engine on then all works for about a minute, then I hear a click the volts start drop on the panel once they get low everything shuts off.
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Old 09-24-2016, 06:32 PM   #8
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Remove and clean the battery connections. Also check that the large circuit breaker between the batteries and the converter/charger is on. I'd also make sure the battery disconnect switch is on. You're not getting any power from the house batteries, just the converter/charger on shore power and the engine alternator and chassis batteries when the engine is running. The charging current is causing the chassis power to be switched to the house circuits.
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