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Old 06-14-2021, 11:14 AM   #1
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12V Electrical Problem

2002 Fleetwood Bounder 39Z, Cummins/Freightliner Chassis.

Plugged into 50 Amps after storage. Red fault (Short) light on Xantrex Freedom 458 Charger/Inverter. One of four 6V batteries blowing gas past a cap. Opened 50A breaker.

Changed all four batteries. Installed new cables. Wired exactly the same as previous. Closed 50A breaker. Charger humming loudly but green charge light on. Ground from batteries to chassis became very hot and red terminal spray smoking . Opened 50A breaker.

Found untightened nut on new ground cable. Tightened nut. Closed breaker. Green charge light and blinking green inverter light. Loud humming. Ground cable getting warm. New batteries sound like they are bubbling. No household 12V power to coach. Opened 50A breaker.

12V Circuit breakers inside electrical box are in. Can't find any blown fuses on the inside or outside 12V panels.

Any ideas?
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Old 06-14-2021, 11:23 AM   #2
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Your coach may not be wired like mine, but this is how mine works. The batteries are the sole source of DC power. The inverter/charger keeps the batteries charged. I have a house fuse and a self resetting circuit breaker between the house batteries and the DC fuse panel.



Here is how my batteries are wired. You should take a photo of yours and share it here so we can verify the connections. Also, you can test for voltage from ground to the post where your positive house cables connect. You should measure 13-14v.

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Old 06-14-2021, 11:27 AM   #3
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What is voltage at the batteries when 120 VAC on?


Heat in a cable or connection means RESISTANCE. Either bad cable or bad connection. FIX THIS.


And strongly suggest either load testing the batteries after fully charging them OR if wet cell, get a battery hydrometer and check them (less than $10 for the hydrometer at any auto parts house).


One bad cell can cause a lot of electrical issues.
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Old 06-14-2021, 01:16 PM   #4
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Found a missing wire

Apologies to all and thanks for the quick responses.

I found a disconnected ground wire that had fallen down behind the batteries and swung forward out of sight. It's black and I missed it on the photos taken before removing the old batteries. All fully functional now.

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