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Old 07-22-2021, 07:31 PM   #1
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No shore power

I知 a newbie to this. I have a 2000 Discovery 37G and I知 confused about the control panel with the battery switches main and aux. my question is when I switch them off and the shore power is on I loose all power and I have to switch them both back on to get power. Why?.
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Old 07-22-2021, 07:46 PM   #2
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There are various designs by various manufacturers in various years so keep that in mind as none of us know every aspect of every RV...

Anyway, the Main and Aux switches shut off battery power (except for numerous phantom loads) which could be set up to also shut off AC if the manufacturer wanted to do that. So best advice would be to find and download the users wiring guides that the house manufacturer created. You're going to need it eventually anyway.

Or you could just wait until someone here on this forum that owns a similar rig notices your post. Shouldn't take long.

Note that for RVs of that era and brand, I don't think they had any 120 volt lights. Did you check things like the outlets that aren't fed by an inverter?

Also note that your ACs won't run without 12 volt. Nor will your refer. Your MW should though. None of the furnaces or the WH will run without 12 volt but they don't usually use 120 Vac. Expect for the WH. The TVs should run but the antenna amp and any satellite gear won't.
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Old 07-26-2021, 05:59 PM   #3
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This is the link to your owners manual, in chapter six you find that the battery switches must always be on when operating the coach. They provide power to the 12 volt system as well as power to the switch over, radio, etc. But yes even on shore power or generator they must both be on. Oddity of model??? My Bounder must have both on as well or I loose internal power.
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Old 07-26-2021, 06:54 PM   #4
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I take it you have an Inverter and NOT a Converter

With Inverter...batteries always supply the RV DC System
Inverter charger maintains battery voltage when connected to AC Power
Turn off the Battery Disconnect...No DC

With Converter....battery supplies RV DC System when NOT connected to AC Power
With AC Power the Converter can/will supply the RV DC System and charger maintains battery Voltage
Turn off Battery Disconnect...converter can provide DC if AC Power is on

In either case..Inverter/Converter...Battery Disconnects OFF---NO Charging
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Old 07-26-2021, 07:09 PM   #5
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Coach in use , or stored with shore power ; switches ON.

Coach in storage with no shore power ; switches OFF.
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Old 07-27-2021, 01:47 PM   #6
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Originally Posted by Bcmckeehan View Post
I知 a newbie to this. I have a 2000 Discovery 37G and I知 confused about the control panel with the battery switches main and aux. my question is when I switch them off and the shore power is on I loose all power and I have to switch them both back on to get power. Why?.
Yes mine does the same. Found out by accident a few weeks ago in Arizona.
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Old 07-27-2021, 01:51 PM   #7
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Part of what you may not understand yet is that the thermostat requires 12 volts. No 12 volts then no thermostat, therefore no air conditioning.
Similar is true for the refrigerator, assuming you don't have a household model. The control panel for the fridge is run on 12 volt power. So without that no fridge.
So it's possible that you still have shore power going into your RV when those two switches are off, but you don't have control over the devices you may want to have running.
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power, shore power

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