This is probably not going to help now but as far as contacting somebody during the weekend, Valley Freightliner up in Mt. Vernon is a 24-hour shop on the weekdays and closes at 5:00 PM on Saturday and Sunday. They are an FCCC Oasis shop (emphasis on accommodating motorhomes and I believe the only Oasis shop in Washington state) and of course will have all the up-to-date wiring diagrams, etc. If they're not busy, they will answer questions and troubleshoot a bit over the phone (or at least they did years ago when I called them). Their address, phone number, and hours: click
Valley Freightliner will also have other locations and does have a shop in Olympia ..actually in the Tumwater area (click
). They will work on motorhomes although they are not a designated Oasis shop and are also open on the weekends. They also have a big facility in Pacific (between Tacoma and Seattle --click
) that will work on motorhomes.
I'm assuming your Tiffin is on a FCCC chassis.
edit: Valley Freightliner in Pacific is open until 2:00 am 7-days a week