I need everyones help. Yesterday while working on my 1995 Newmar Kountry Air (50 amp) I accidently shorted out from ground to one leg of ac power. where it comes in to pannel box. I still have shore power to transfer switch, power going out of transfer switch, then no power coming in to main panel box. In order to get power I used 2 adaptors I step down fromm 50 amp down to 30 amp down to 15 amp in order to plug in to extention cord. I kepted all breakers off to MH loads. When I switched on breaker marked light it tripped. It appears I tripped something before panel box, any clues what to look for!