Originally Posted by Garrette
Sounds as if your house batteries are weak but you did run genny and it starts on house batteries. Hummm. Check house batteries for loose connection and water. As understand it, high 12volt amp energy usage requires fully charged house batteries as the 12 volt charger does not put out the amps required for the high amp devices. Start the engine as it charges the house batteries and the alternator w
ill put out more amps. Just thinking out loud.
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This may have nothing to do with a motor home, slide out but on our 10 and a half foot camper, there was a big warning. Do not attempt to operate the lifting jacks while plugged into shore power. To do so would blow every conceivable fuse in the converter charger circuit. It also had something to do with making sure you had the batteries turned on and fully charged to operate the lifts, which were remote operated very much like a four-point automatic leveling system.
So many spooky things going on at the same time says to me check the power that powers the slides. If there is 12 volts there, attempt to operate them with the voltmeter in place and see how bad of voltage drop you get. This problem smells like something that won't work because of low voltage which would mean either insufficient charge in the batteries, the power not turned on in that circuit at all, or perhaps something as elusive as a bad ground that will give you 12 volts with no load but give you nothing or near nothing as soon as a heavy load is on the circuit and the voltage drops. Sorry I don't have anything more. that's just an armchair analysis as I sit here in front of the TV. And that is television set not tow vehicle.