David, welcome to LCL! Sounds like you’re on the right track, this forum has very knowledgeable members always willing to help, and has easily searchable archives the will provide solutions for almost anything you run across.
The generator running is a good sign, could be as simple as an incorrect switch setting, bad connection or blown fuse.
Costco has a rearview camera for $200 that I installed in my coach and it’s worked flawlessly.
http://www.costco.com/.product.11526...rySiloedViewCP The kit includes everything you need to install, and comes with some technology upgrades from the last 25 years that you will appreciate.