Hook up to 110V AC power source and turn on everything you can that runs on 12V DC......then listen for a fan to come on.
Locate where that fan noise is........it would be the cooling fan for converter.
Converter should have 12V DC distribution with fuses.
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31