Can anyone tell me where the wiper control module is located on a 99 Chieftain 35U (Ford F53 chassis) My wipers will jump from delay to full on (low speed). Also when I turn off the wipers, they stop where they are, and won't return to the off (resting?)position. The switch appears be working. Can this module be replaced by myself, or will I need to carry it to the Winnebago dealer? Will apprecate any help.