This standalone guide turns the converter/fuse-panel decision tree into a repeatable diagnostic process.
Start at the battery
Measure battery voltage at the posts before and after connecting shore power. A charging system should raise voltage according to battery chemistry and charge stage.
Prove converter AC input
A converter cannot charge without 120V input. Check its breaker, plug/receptacle if equipped, and any GFCI that might feed it.
Inspect DC output and protection
Reverse-polarity fuses and main battery fuses protect expensive parts and wiring. If they open again after replacement, stop and find the fault.
Separate branch problems
If one circuit is dead but others work, test that branch fuse and ground path. The converter may be fine.
Watch heat
Blocked ventilation, failing batteries and overloaded converters create heat. Hot plastic smell or discoloration is a stop sign.
Keep troubleshooting
Use these related RV Solver resources to narrow the problem and avoid parts guessing.
When to call a professional
Call a technician for internal converter testing, inverter/charger systems, repeated fuse failures, lithium configuration, hot wiring or burned connectors.
Sources and editorial notes
RV Solver pages are written for practical owner education, then safety-edited for common electrical, propane, water, roof, appliance and towing risk points. Always confirm procedures with the manual for your exact RV and installed component. See our editorial policy.