I'm working on and nearly done with repairing water damage to the 2004 camper. I've now discovered there are several 12V circuits not working including fridge, furnace, hot water and some lights. Others such as the slide out and vent fan are working. I checked all fuses at main panel and have good voltage going out. I have nothing however at the devices. Can anyone advise? Are there any more fuses, junction boxes, etc. that I'm not aware of? Any input would be appreciated.