Just had an issue with mine this past weekend on a trip. First time ever as I keep my jakes on almost all the time. Found breaker in compartment below driver, top door, tripped (think 49) Reset and jakes worked again. First time in 50,000 miles and 9 years that happened. If yours is intermittent don’t believe that would be your problem. Think There’s also a breaker in back associated with them also. Would have to look in my manual for that number. Should be on your door if info tags are still there.