Cody - I just looked at your other post. Doesn't Great West have a manual to download for your year and model? Your setup is a bit different from our Roadtreks. We have a battery switch on an interior wall. If we want to use just 12 volt power in the van, that switch gets put on. The way the newer RTs are wired, if we are going to run the generator or plug into shore power that switch has to be put on first. This switch seems similar to the switch that you found under your step with the battery. What our switch does is connect the battery. Off the battery is disconnected and offline. If we leave it on while the van is not in use - say for a day or more on the driveway, there are things in our Roadtreks that will drain the battery with that switch on. Our CO Detector and Propane Detector are on when that switch is on. If we are in the van we want them on but if the van is sitting on the driveway at home there is no reason to have them on and power draining from the battery. So if I am not using my van that battery switch is always off. Once we start a trip it goes on and stays on until the trip is over - and the Roadtrek is wired to charge the battery when driving or when connected to shore power or when the generator is running. Your Great West may be very different. Roadtrek has manuals that go back to the 1990's - Great West must have manuals available too. Try contacting them.
Take a look at my site, linked below my sig. While I write about Roadtreks, there may be things in article links on my Living in/How to page that are general enough to apply to your Great West also.
