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Old 01-07-2016, 09:06 AM   #1
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12 Volt Problem

Friend has a 2007 Fleetwood Jamboree 31K. Has started having 12 volt problems. Dead cell in 1 battery and mixed battery types. Had him buy 2 new 6 volt batteries to replace old ones. Still has problem. Turn on one 12 volt light and voltage drops to 10 volts. Batteries indicating 14 volts with no draw. Have looked for blown fuses but can't find any no good. Turn on 110 volt draw and 12 volt lights dim and flicker. Any suggestions???
Thanks.
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Old 01-07-2016, 09:17 AM   #2
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I would check the converter. Sounds like it's the culprit.
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Old 01-07-2016, 09:19 AM   #3
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Is that 10 V measurement directly at the battery, or is it someplace else? If it is someplace else, look for a loose or corroded connection.

Joel
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Old 01-08-2016, 10:31 AM   #4
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Quote:
Originally Posted by J Birder View Post
Is that 10 V measurement directly at the battery, or is it someplace else? If it is someplace else, look for a loose or corroded connection.

Joel
10 volt measurement was taken from cigarette lighter adapter for charging 12 volt applications. Measured 14 before and dropped to 10 with one light on. Measuring directly from the battery shows no drop in voltage. Suspect Converter is not functioning properly but gonna be a bear to get out!
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Old 01-08-2016, 11:41 AM   #5
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If the converter was not functioning, the voltage at the battery terminals would be low too. You have either a loose connection, or a corroded connection.

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Old 01-08-2016, 12:23 PM   #6
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Nothing wrong with your converter since it it putting 14V on the battery.
this means you are plugged into shore power, and the converter is charging the battery.

A lot of people don't understand the concept of a "voltage drop".
You will only see a voltage drop when current passes through a resistor.
No current = no voltage drop.

A wire is actually a resistor, with small gauge wires having higher resistance.
IMPORTANT...no matter how high the resistance (or how small the wire), there is no voltage drop if there is no current.

This means if you wired up a 12v 50w light bulb with 20Ga wire, the light would be very dim. BUT...if you removed the ground from the bulb, and then measured the voltage, you would see 12V. Reconnect the ground and you will see a major voltage drop, maybe 8V at the bulb. That is why it is dim.

So your problem is a poor connection somewhere in the circuit. Corroded terminals, or a bad battery disconnect relay for instance.

You need to start from the battery and measure the voltage and work your way through the circuit.

Hope this helps,

Dan
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