Step one is to get a good idea of what is and is not working and a first big step is to know which RV you have as what you tell us is not listed by Winnebago!
Step one? Which RV?
This will take you to the list of wiring diagrams:
https://www.winnebago.com/Files/File...ram/Wiring.htm
I am assuming you mean you have 2017 Minni Winnie 31H?
They list none, so we are dead in the water for getting the right info!
If unsure of what you have, there should be a label near the driver's side to tell you a lot of that important stuff you will need to sort out what you have and possibly the build date to get to the correct wiring.
Once on the right group, you will likely need to find the "exterior lamps" section.
Down about sheet two, there is likely to be a drawing for the taillights, turn signals and brake lights. That will give you circuit ID for each. Using that ID, you can go to this list to decode the ID from the drawings or as it is stamped on each wire.
https://www.winnebago.com/Files/File...ical_guide.pdf
This is an example of what you are likely to find but not sure it will be the correct info for your RV!
With a meter, you can check the bulbs for continuity by testing the resistance from one pin to another or by switching bulbs. But you need to check the bulb holders as they tend to get corroded if they are leaking.
With your limited experience on working on the lights, this will be a bit of learning experience and take some time and dedication to get it right.
If some of the taillihghts are working on one side but not the other, it is not likely to be a fuse problem as both sides are on the same circuit when I have checked.
The tail lights as well as front lights should all light when the switch is on, so check what is working or not before trying to change fuses, etc.
Both right and left side brake lights should come on at the same times, as well as the connection in the trailer plug. Side clearance lights are wired the same.
On the correct drawing it will have a trace showing how the wiring is routed across the back and where it may go along the side or underneath.
I might first verify that the power is getting to the bulbholders and the bulbs are good. Check for leaking which happens often on RV that are not kept sealed well. If you find rust or water in the lights, it may require changing out the bulbholders or fixture.
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