Rufus, we also have an 8V-92 on the 1992 Beaver XL 40 Prevost. If yours is like ours, you can goose the throttle sitting still, with your drivers window, open listen for the warbling growl as the jake slows engine RPM when you remove your foot from the accelerator pedal. If you don't hear the racket, then check the relay. If it still doesn't make the required noise upon decel, something is up.
Our Jake is OK to weak going down mountain grades with a 5700 lbs Lexus style Toyota Land Cruiser in tow. We sold it a week ago, and will be towing a C Class Mercedes stick shift wagon at only 3300 lbs. I hope to notice a difference decelerating with our jake.
Jim and Chris
2001 Featherlite Vogue XLV 2 slide with Rivets-current coach, 1999 shell
Previous 22 years,
We have owned every kind of Prevost shell but an H3-40