First eliminate the pedestal. Unplug your RV and plug a lamp into the plug see if it flickers. If it does you know the problem is there.
Are you using a good surge protector? They will indicate if you have an open somewhere or an intermittent. Then try the suggestions above.
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS