Mine is located on top of the breaker box which is mounted on the rear interior skin underneath the bathroom vanity. Access through the rear, outside storage hatch.
Also, after checking the wireing and dredging my memory, I believe the light illuminates only when there is an electrical input polarity problem.
Here's the reverse polarity light thread. If that light is on you can get zapped when touching the coach skin from outside. You'll see there are better and more sophisticated cheap alternatives nowadays. http://www.airforums.com/forums/f447...ht-155861.html
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