Bill wrote
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Second, there is probably a 12-volt output fuse somewhere within the converter. You need to find that fuse and check it.
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The WFCO manual covers the 8935, 8945, and 8955 units, so there is no need to determine which one you have.
On page 2, there is mention of "reverse polarity fuses". They are protective devices - if you hook the converter up backward, even for a moment, these fuses will blow, protecting the converter. On page 6, you can see the location of these fuses - they are easy to check.
Some converters have a second fuse in the +12VDC output line, to protect against loads that are higher than the rating of the converter (35 amps, 45 amps, or 55 amps). I don't find mention of such a fuse in the manual - perhaps the WFCO does not have one.
The ultimate test, as described in detail on page 7, is to disconnect the battery, then power up the converter and confirm that it is providing 12VDC at its output.
Bill