always my pleasure. you do NOT need to go ripping and tearing into electrical components and wiring harnesses. you'll drive yourself nuts. do the simple thing first and hope that is the problem. the simple thing is very carefully inspecting the female spades of the fusebox that holds the relay. you mentioned that they look dirty and corroded. right there is the likely source of the problem. they must be tight and pristine. NO corrosion or dirt. start there. 90% of these relay problems lie in that area.