My generator didn't start so I changed the house battery I accedently put the post backward my radio quit working completely my Tv quit working so I looked for fuses the Tv was blown I changed now it works my radio fuses are good but still no radio unless there's a fuse behind the radio I didn't check ?? But now when I plug into 30 amp power it's not keeping my battery in the cab charged because I'm running furnace for a while then the letter c comes up on refrigerator which means lack of power even while plugged to campground power also my cab battery was dead the other morning because the fiend was running off that battery so I have to keep running my engine periodically to keep furnace and fridge running or it will kill my battery anybody knows what going on??
Open the cover on the converter and there should be a sticker which will identify what each fuse powers, pull the reverse polarity fuse and see if its blown, as Grumpy said may be more than one.