Originally Posted by NitroNut
So, just to clarify, if I just keep camper hooked up to my truck, while I'm opening/closing slide,I'll be ok, correct? Like if I were camping at a rustic campground with no power hook up for instance.
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As others have explained, your slides operate from 12 volt DC. If you plug into your friends cabin with 120 volt AC, then all the 12 volt DC things operate off of your converter instead of your battery, which converts 120 volt AC to 12 volt DC. Even if are using a converter at max (running many 12 volt DC things at the same time), the converter usually only draws around 8 amps or so from your friends cabins 120 volt 15 amp connection. You should not be in any danger of tripping his breaker, if it's properly wired and nothing else is really on that circuit there.
I always recommend to those just beginning, these two great articles by Mark Polk, that explain RV's electrical systems as well as the converters function in fairly easy terms.
Basic RV Electricity - RV Information (RV Maintenance)
RV Converters and Amp Draw - RV Information (RV Maintenance)
Also not knowing what brand water heater you have, I also recommend reading this FAQ if it applies to you. Many a dealer fails in the PDI to properly explain the dual operation of a Suburban water heater (if applicable)
Suburban's electric switch and much more
Welcome aboard, and feel free to ask any/all questions. That's what these forums are for, to help one another and share knowledge.