You should be able to see the parking brake switch that is activated by setting the brake. You may have to almost stand on your head to do it though. I have to twist around like a pretzel to see mine.
My switch was being blocked by a wire. I moved the wire out of the way and it has worked since.
A number of people have reported that the switch had to be adjusted to get it to work.
Clay (WA5NMR), Lee (Wife), Katie & Kelli (cats) Salli (dog).
Fixed domicile after 1 year of snowbirding and eleven years Full Timing in a 2004 Winnebago Sightseer 35N, Workhorse chassis, Honda Accord toad