Electrical problems are among the most frustrating issues RV owners face — and among the most common. Whether you're dealing with a dead battery, tripped breakers, or appliances that won't run on shore power, a systematic approach to troubleshooting saves time and helps you communicate clearly with a technician when professional help is needed.

Understanding Your RV's Electrical Systems

Most RVs have three separate electrical systems that work together:

Shore power (120V AC): Powers your air conditioner, microwave, outlets, and other high-draw appliances when plugged into a campground pedestal or home outlet. Managed by a breaker panel inside the RV.

Battery/12V DC system: Powers lights, fans, water pump, slide-out motors, and control boards when not plugged in. Fed by your house batteries (typically one or more 12V or 6V deep-cycle batteries).

Converter/charger: Converts shore power (120V AC) to 12V DC to run the 12V system and charge the batteries when plugged in.

Troubleshooting Shore Power Problems

Nothing works when plugged in:

1. Check the campground pedestal breaker — it may have tripped
2. Check your RV's main breaker (usually a 30A or 50A breaker at the power inlet)
3. Test the outlet with a different device to confirm the pedestal is live
4. Check your surge protector or EMS — it may have shut down due to low/high voltage

Some circuits work, others don't:

• Check individual breakers in your RV's breaker panel — reset any that are tripped
• On 50A service, each leg powers different circuits; a failed leg at the pedestal can knock out half your circuits

Outlets work but appliances don't:

• Check GFCI outlets — one tripped GFCI can kill multiple outlets on the same circuit
• Test with a different appliance to confirm the outlet is live

Troubleshooting Battery/12V Problems

12V system completely dead:

1. Check the main battery disconnect switch — it may be off
2. Check battery voltage with a multimeter — below 12.0V indicates a discharged battery; below 11.5V may indicate a failed battery
3. Check the fuse panel for blown fuses (usually located near the battery or converter)
4. Check battery cable connections — corrosion at the terminals is a very common cause of 12V failure

Batteries drain quickly:

• A parasitic draw is consuming power when nothing should be running
• Common culprits: a stuck relay, a faulty inverter, a malfunctioning control board, or a light left on
• Disconnect loads one at a time while monitoring current draw to isolate the source

Converter not charging batteries:

• Check that shore power is present and the converter is receiving power
• Test converter output voltage at the battery terminals — should be 13.5–14.5V when charging
• A failed converter will not charge batteries even when plugged in

When to Call a Professional

Some electrical issues are safe to troubleshoot yourself — checking breakers, testing outlets, inspecting battery connections. Others require professional diagnosis:

• Any issue involving the shore power inlet, main breaker, or wiring inside walls
• Inverter problems (high-voltage DC systems)
• Converter/charger failure
• Persistent parasitic draw you can't isolate
• Any burning smell, melted wiring, or signs of electrical fire

Done Right RV Repair provides mobile electrical diagnosis and repair throughout North Texas. Our RVTI Master Certified technician has the diagnostic equipment to find problems quickly and the expertise to fix them safely. Call us or request service online.