RV owner's field notes · August 18, 2026
RV Won’t Run on Shore Power: A Simple Way to Narrow It Down
Learn how shore power, breakers, the converter, batteries, and branch circuits relate when an RV will not power up at a campsite.
“The RV has no power” is a useful emergency description but not yet a useful diagnosis. An RV can have 120-volt shore power, 12-volt battery power, converter output, generator power, and inverter power—each with different paths and protection.
Start with the power boundary
Without opening a live panel, note what works and what does not. Interior lights and water pumps usually use 12 volts. Outlets and air conditioners use 120 volts. The converter connects the two systems by supplying 12-volt loads and charging the battery when shore power is present.
| What works | What does not | Where the next question points |
|---|---|---|
| 12-volt lights and pump | Outlets and A/C | Shore cord, pedestal, inlet, main breaker, or 120-volt distribution |
| Outlets | Battery charging or 12-volt loads | Converter, fuse, battery connection, or DC distribution |
| Nothing on shore power | Battery-only items may still work | Pedestal, cord, inlet, main protection, or transfer path |
| One outlet or appliance | Other circuits work | Branch breaker, GFCI, outlet, appliance, or local wiring |
| Generator works, shore power does not | Shore power path only | Cord, inlet, pedestal, transfer switch, or shore-side protection |
Check the obvious items without creating a new hazard
If it is safe, verify the pedestal breaker and the RV’s main breaker. Look for heat, discoloration, melting, a burning smell, buzzing, or a loose connection. A single reset after a known overload is different from a breaker that trips again immediately.
Do not bypass a breaker, use a damaged cord, or open the 120-volt panel because the lights are out. If the cord or inlet is hot, damaged, or discolored, disconnect only if you can do so safely and get help.
When mobile electrical diagnosis helps
The useful measurements are taken across the actual path: incoming power, protection, distribution, converter output, battery voltage, and the affected load. A technician can also help separate a campground pedestal problem from an RV problem without asking you to guess at expensive parts.
See RV electrical repair service in Nashville or call (629) 302-4948.