Welcome to the "Safari Zoo"
Went through the same confusion with my camera system in my 97 Serengeti. If you have NOT changed out your old style (non-HD) tube TV, the the problem is that you need to turn your inverter on (to power the TV), and then there is a series of 3 toggle switchs just behind the Allision Transmission pad. (From Memory) the one nearest you is the switch for turning on the 12 vdc camera. Both the camera and the TV need to be on at the same time.
I eliminate the problem in the upgrades to a new LED HD TV, and, adding a 12 vdc drop down viewer which eliminated the inverter being turned on. Plus, as an added bonus, I no longer have to crane my neck looking at the TV. The drop down viewer looks and acts just like a "Rear View Mirror."
Last but not least, 3 Safari Websites I would highly recommend you joining, and getting detailed plans on the drop down 12 vdc viewers quite a few of us have done are:
1. Safarifriends : To promote the exchange of information regarding SAFARI MOTORHOMES.
3. SafariCoaches : Sharing about Safari Coaches lifestyle
Real helpful and friendly folks there, and valuable info & pics.