Cruise and wipers wouldn't have much in common. I'm not a WBGO owner, but I have heard that W is very good about providing electrical diagrams. I would contact them for help. With a schematic and their guidance, you should be able to identify the common point quickly.
John & Diane, fulltiming since '12
'02 DS, FL, 3126, '04 Element
John & Diane, Fulltimers. RVM103 NHSO
On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element