Lots of unknowns here. I would suggest getting a plug in volt meter and a circuit analyzer at the RV store. These plug into any 120v receptacle, and tell you the voltage of the shore power and if the common/power/ground connections are correct. If nothing shows on these gauges, you might have a bad SP cord or connection. If they show power is present, then your battery charger might have failed.
1997 Roadtrek Popular