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Check the hot lead into the key switch.......if you have power there, then the switch went south. IF not, let me know and we will dig deeper. You may need to get a manual for the wiring colors in order to tell. I can look and see what I may have on that, but doubtful. All follow ups are included in our fee. Check for power INTO the light switch as well. A 12 VDC test light is very helpful here.
It can turn on power to a number of things..............depends on the vehicle. More likely the headlight switch..........but, just trying to cover all the bases of things to check.
I am not sure you really have the skills that are needed to track this down............it isn't that hard. And we surely can't recall all the 1000 or more makes and models and we here on site don't have the ability to see your coach. So I suggest that you just call a mobile mechanic to come over and sort this out. It shouldn't take more than about 10 minutes. And yes........I did have to pass tests and learn quite a lot over the years in order to be a Master Certified Technician. I have nearly 9000 customers on this site who like and appreciate the answers I gave them. Most were way more difficult than this. I will opt out of this and let another tech offer something, if they can.
Do you have 2 accounts, I helped a customer with the identical question on the 13th in the afternoon though they never viewed nor responded?
I attaching a link for you to the Winnebago Wiring Diagrams so you can resolve this............http://www.winnebagoind.com/diagram/Wiring.htm
Check with Ford.............or pick up a chassis manual from Faxon Automotive Literature or one of the other manual outlets.
Let me know which tech you want to work with. The original tech helped, opted out, I chimed in, then the original tech decided to help again. If its a F550 and the front of the RV looks like a Ford super duty, then i can help diagnose this.
Owen, as you can see there are 2 experts trying to help you here. The original that opted out and then came back in and then myself in the middle there. I bowed out because the original expert came back in. We are not a scam, we have to get the correct info though for us to help.
I asked do you have a F550 or a F53 chassis. You said its a F550. I asked if the front end looks like a For super duty. You just replied moments ago saying no. So that means you do not have a F550, you have a F53.
I had to confirm this or all my help would be wrong. Now that I know you have a F53 chassis do you want me to diagnose no power to the dash? If so respond with "Yes Chris"