When you say that your phone does not charge properly, are you using a 110v charger with a 12 volt DC output? If so, you may not be getting 110 volts AC at the receptacle that you plug the charger into. You can check this with a multimeter set on AC volt range. Be careful not to touch probes when touching the contacts inside the receptacle. I have a cheap plug-in AC line voltage meter that I leave in a receptacle so I can check AC line voltage at a glance. If you are not getting 110v AC into your rig, you may have a "transfer switch" that isn't working, a tripped circuit breaker, blown fuse or a break in the AC wiring. It is not safe to work on 110 volt AC electrical circuits unless you are sure of what you are doing and take proper precautions. Old RV's are liable to have had two or more previous owners doing DIY fixes, modifying or disconnecting electrical systems.