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Old 06-13-2021, 06:47 AM   #1
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12 volt problem

I have a 2002 holiday rambler Neptune nothing inside coach works on 12 volt. Please post what problem may be where it is located and pics. No electrician so do not know much about it.

Thanks
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Old 06-13-2021, 07:04 AM   #2
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There may be a switch near the front door that is labeled battery disconnect or something similar. On my rig this controls a solenoid in the back electrical compartment, the solenoid shuts off all 12 volt to the house.

If you have a switch flip in on/off and see if that fixes it.


If not and you have the solenoid it may be bad, they are known to fail and you can bypass if by just connecting the 2 large cables together and tape up the small wire.
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Old 06-13-2021, 09:46 AM   #3
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There is no solenoid switch up front by the door if it is by the batteries please list a pic so I will know what to look for and how to fix ut
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Old 06-13-2021, 09:59 AM   #4
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Post a picture of switches by passenger right armrest.
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Old 06-13-2021, 10:35 AM   #5
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Ok going to try this
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Old 06-13-2021, 10:38 AM   #6
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The switch is off right now but it make no difference on or off goes not work. The light underneathh on but step will do nothing. I still do not have any 12 volt lights inside that works already check fuses.
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Old 06-13-2021, 10:53 AM   #7
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I agree with Jim. There should be a 12VDC cutoff switch around the door somewhere. My 12VDC cutoff relay has gone bad twice! The last time I just bypassed the relay since I never used the switch anyway.

Look in the electrical compartment near the batteries for a relay labeled "Battery cutoff" or something similar. Use a DC voltmeter to check for voltage on each of the large red wires on the relay. If you get 12VDC on one red wire and not the other then the relay is bad or the switch is turned off. You can just put the two large red wires on the same terminal post to bypass the relay.
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Old 06-13-2021, 11:02 AM   #8
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The pics below show the diagram on my compartment door and the relay at the bottom after I bypassed it.

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Old 06-13-2021, 11:20 AM   #9
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Here is what I have by the batteries
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Old 06-13-2021, 11:26 AM   #10
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This is a pic of what I have
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Old 06-13-2021, 11:32 AM   #11
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Sorry here is the pic
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Old 06-13-2021, 11:36 AM   #12
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Here is pic
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Old 06-13-2021, 11:54 AM   #13
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If I bypass the relay will it correct all the 12V if no fuses are bad? Also does the 12 volt stay hot all the time? If so just make sure all 12 volts stuff is off what about fridge and water heater will it run batteries down even though you are hooked up to shore power?
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Old 06-13-2021, 02:41 PM   #14
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I have checked the 2 big red wires coming out of relay they both have 12 volts
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