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Old 03-05-2019, 04:43 PM   #1
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Urgent please help me lost all 12 volt RV is going to freeze

sorry to make another urgent post but today I came home from work and all of the 12-volt systems in the RV are not working except for the Magnum power management and the 12 volt battery heater which are working fine.

the batteries are also charging however all of my 12 volt lighting and most importantly my furnace controls are dead.

my electric water heater is also not working nor is the entire control panel for my slides tank water heater etc.

I don't know what to think it doesn't seem like it would be the inverter because the batteries are providing power but I have no 12-volt systems at all except for the bay heater which is working fine.
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Old 03-05-2019, 04:44 PM   #2
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My EMS is also not lit up but the coach is getting AC just fine. Fridge and microwave are fine..

No water pump, no thermostat, no 12 volt lights
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Old 03-05-2019, 04:51 PM   #3
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The slide motors also work so there's definitely 12-volt power going to some places but not to my water pump or any of my lighting
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Old 03-05-2019, 04:54 PM   #4
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if I can't manage to get the blower motor on my furnace going again everything is going to freeze and there's going to be severe damage is 5 degrees here
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Old 03-05-2019, 05:07 PM   #5
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You may have a large ANL fuse blown on the house side of your DC system.

From your house bank, follow the positive side until you come to a fuse and test for power on each side of the fuse.
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Old 03-05-2019, 05:11 PM   #6
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Do you have a 120 volt space heater you can plug in while you're tracking down the problem?
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Old 03-05-2019, 05:12 PM   #7
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Just a thought, have you checked the battery switch (salesmen switch) near the door? Try cycling it once.
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Old 03-05-2019, 05:13 PM   #8
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Your looking for a fuse like this usually inside a protective coverClick image for larger version

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Old 03-05-2019, 05:15 PM   #9
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Also, make certain the disconnect switches at the door and/or at the inverter are on
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Old 03-05-2019, 05:18 PM   #10
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Also check battery cables, especially main ground cable on the house side, for tightness
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Old 03-05-2019, 05:22 PM   #11
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If your shore power had a spike it may have fried a control wire from the inverter to the controls. Your slide power is likely a different 12 volt circuit than the lighter loads.
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Old 03-05-2019, 05:24 PM   #12
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Also check for a reset switch on the inverter itself or inline fuse for the control portion.
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Old 03-05-2019, 06:28 PM   #13
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As mentioned above, if times runs out with dropping or freezing outdoor temperatures, pick up a couple of 120 volt portable heaters to use while furnace is not operational. One heat should maybe go in the basement near plumbing area.
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Old 03-05-2019, 06:46 PM   #14
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Before you drive your self nuts. Start at the beginning (shore power)and work your way back to the breaker panel. Be sure you have 120 volts on both legs of your shore power. 240 between them. All the way back to the main breaker. Check you Converter circuit breaker in the panel. Check the converter output voltage. The EMS not being lit is the clew as to where to start.
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