2006 F350 interior and cargo light randomly turns on when truck is off. Ford mechanic said it was the security module which I replaced but it is still occurring. After engine is shut off about 15/30 minutes lights turn on for a few minutes and then shuts off and repeats until I unhook battery. When this happens there is a clicking under dash where wire harness (I believe from door) is connected (white block). Any help on the cause.