With these types of problems, a little bit of logic goes a long way. If ANY 12V device works, then you are getting 12V from the converter or the battery. The converter takes 120VAC and converts it to 12VDC. It does not control individual devices, it sends 12VDC to a buss that feeds the individual fuses. You can verify the converter operation by seeing if , guess what?, any 12V device works. If it does, the circuit breaker feeding the converter is operating and the converter is working. Check this by turning off or disconnecting the battery. If any 12V device works, again, the converter is fine and you have a problem with the individual circuits/devices. Even with the battery connected, if you are plugged in, the converter ignores the battery except for charging and supplies ALL of the 12V DC for the trailer. The converter does not need the battery to operate.
Along with logic, a certain amount of self-education is beneficial. If you ask how to diagnose an electrical issue and you do not know what runs on AC and what runs on DC, then you probably are not going to get a helpful answer.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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