Welcome to the forum and irv2.
In the Spartan Chassis forum
you will find wiring diagrams in a sticky top of forum that may help you.
You may want to check the grounds also for loose connections while your at it plus your battery connections on fuse panel.
In my signature below are three links that will steer you to more wiring and battery info for your Newmar.
Here is a Brochure
and Owners Guide