Vent fan wiring diagram for 97 Roadtrek 190 Versatile/other questions.

[K1ngN0thing]

I need to drill through my roof to wire my solar and don't want to screw anything up. How does the vent fan wire usually run? I'm having trouble finding a diagram.

Also, my unit didn't come with a shower, but I see where it would connect if it had one. How difficult is it to install my own? How do I regulate the temperature and flow?

I'm also not exactly sure where the spark plugs are. I have a misfiring cylinder to diagnose. Can I get to them from the front or do I have to open up the doghouse?