its water......mositure,what ever....change entire fusebox your done....big job btoo....ford knows trucklleaks...
cost me 700 hundred..3 days.
started with doorlock.....then 1 day radio on off....maybe lights on door stayed on....or something weird....
once this truck acts up....its the fuse box....1 area at a time till it goes.....im not sure if windsheild was replaced...but he said he knew about problem and fixed it....check carpet under emergency brake REAL WELL....bet it got wet in the past,,,,right under panel on left of parking brake | 
