Staff Answer
Sep 25, 2026 - 07:02 AM
To check the polarity, use a multimeter set to DC volts at the 12V input terminals on the refrigerator's power board (behind the outside lower vent). Put the red lead on the terminal marked positive (+) and the black lead on negative (-). A positive reading of about 12 volts means the polarity is correct. A reading with a minus sign means the wires are reversed. Low voltage (under about 11.5 volts) can also keep the fridge and light from coming on, so check that too.
Also check the 12V fuse at your RV's fuse panel and any fuse on the fridge board. Our Norcold won't turn on checklist and won't turn on help articles walk through each step. If you need more help, our Tech Support service can diagnose it with you.
If you have any questions, just reach out at info@rvfridgeguys.com or call us at 800-712-8822. You can find everything we carry at www.rvfridgeguys.com.
