If it is like my 2006 Ambassador it is wired like this:
1. One of the three phase outputs is wired, through a fuse (at the alternator) to a 6 volt relay (in the driver's side electrical bay under the driver.)
2. The relay the turns the light on and off.
Things to check include the fuse, and power at the fuse (AC?) Then check the relay which may be where mine is. My guess is that either that fuse is blown, the relay is bad, or the alternator isn't working properly.
I can dig up a schematic if you want for my coach. Dug and found this one...
My name is Peter, and I'm never going to grow up.
- Winnebago Era 2010 Class B
- Holiday Rambler 2006 Ambassador 40-DFD Class A