Workhorse P32 Electrical Gremlins

[namvet]

I have a 2001 Itasca Suncruiser built on a 2000 P32 Workhorse chassis. I've owned the rig for seven years. I've tried to review the posts on similar problems but haven't found a match that corresponds to the "gremlins" I am experiencing.
I have had the ignition switch replaced three times due to a "burn out" each time. After the last installation, I had the GMC Workhorse ignition relay assembly installed. I have not had any ignition switches go bad since then. After the last replacement (but prior to installing the relay assembly) I noticed that cruise control, the horn, intermittent wipers settings, and the windshield washer pump would not work. The turn signals, headlight dimmer control, and high and low speed wipers work fine. I have checked all of the fuses, relays, etc., all to no avail.
In what may or may not be related to the wiper issue, the last trip out, the wiper arms became "disoriented"! For years, the arms have stopped adjacent to the center windshield post. They now stop at the far side of the travel position away from the center post. I have checked the sacrificial arm inserts and they are fine. I re-oriented the wiper arm connections to be adjacent to the post with the switch off only to find that the arms then traveled across the center post and down towards the grill, which indicates to me that the position of the wiper motor shafts has changed. Don't know how this is possible!
Sorry for the long post but I would appreciate any assistance anyone could provide on either issue. I am at my wits end!