Not sure how yours are set up but on my HR, only the ones with the light bar will light up when activated: Block Heat, Jake Brake and Mirror Heat. Pic below.
A previous owner had put a velcro strip on the Jake Brake switch. That is actually pretty handy as I can always find it by feel. I use it all the time and hardly ever need to use the service brakes until I need to come to a stop.
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2004 Holiday Rambler Imperial 40PKD, Cummins ISL 400
2019 Buick Envision AWD
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