The shore power sequence for your RV.
Shore power to the surge guard, It monitors voltage and some other things and if they are out of spec that's as far as it goes.. It has a display that tells you if it's allowing power to pass or not.. check it.
Then to the automatic transfer switch: These have been known to fail. Two types of ATS.. Mine naturally sits in "SHORE POWER" mode. if the generator starts up and sends power it transfers.
Others I've seen naturally sit in "Disconnected" and will connect to SHORE if Shore power is present and generator off.. Sometimes they flub the transfer however (mine can not) and this damages things.
Then to the main breaker box and from there off to everywhere else. This part IS working else the generator could not power either.
Suspects. the Surge guard, doing it's job as designed, And the ATS not doing it's job.
NOTE: if you have an auto-former. that goes before the surge guard.
