HELP!!!Shut off and now nothing, no lights nada nothing
A year ago traveling through the DC area, I pulled into Camperworld, shut my RV off and when I came out it wouldn't start. Here is what I know. When you turn the key it will do nothing, not one light, sound or anything anywhere in the RV. I Recently just replaced the two 6volt deep cycle batteries and the battery under the hood. No dash lights no 12 RV anything inside. Camping world was booked out 6 months but they did spend 2.5 hours with no success and no ideas as to what it could be. I towed it to another RV shop who does not do Chassis or under the engine work, but they looked at it for a couple hours with no success as well. the 12 volt system was not working off of batteries before this either. The only way the 12 volt would work was if it was plugged into shore power. there were a few times that it wouldn't switch back to 12 volt power prior to that either after being unplugged. there was random clicking noises being made from the relay box under the hood as it was plugged into shore power too. I also had issues with the generator not switching back and forth well from generator to 12 volt. I have paid for storage for a year. I live across the US, and I ended up buying another RV since I travel and live in it full time. I am open to suggestions or any mechanics in the DC area that travel. I am handy and can do most anything if I know what it could be. Thank you ahead of time for any help. it is a 1998 Damon Intruder class A 36' with a 440 ford chassis.