RV Technician how-to

How to Troubleshoot an RV That Has No 12-Volt Power

12V runs lights and controls.

Updated By the Career Education Institute Curriculum Team
Quick answer

12V runs lights and controls. In short: check; test; check, then complete the remaining steps below.

Step by step

  1. Check the battery disconnect.

  2. Test battery voltage.

  3. Check fuses.

  4. Test converter output.

  5. Check grounds.

  6. Repair and test.

Safety reminders for RV technicians

  • Leak-test propane
  • Use fall protection on roofs
  • Disconnect power
  • Ventilate spaces

Converter · Inverter · Shore power · Black tank · Gray tank · Slide-out: see the full RV technician glossary.

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