If you have a 30 amp shore power system, then you probably have a WFCO 45 amp or 55 amp power center. On most models, the converter is mounted to the back of the power center (the part with circuit breakers and a vertical row of DC fuses). On older models, the reverse polarity fuses were located on the converter. You'll need to pull the power center away from the wall/cabinet to access the fuses. On newer models, the reverse polarity fuses are located on the face panel of the power center, just to the left of the vertical row of "blue 15 amp fuses".
The first picture is the old style, located behind the power center
The second picture is the newer style with the two fuses (red) located just left of the DC distribution panel.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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