Exhaust brake quit working
Lets try this again! Need some help. Cummins 400 isl, spartan chasis 2006 travel supreme. I guess next will be taking it to a tech!
Forum Discussion
With a two stage engine compression brake, you WILL have an electric signal that both downshifts the Allison (left or only shift pad window will change from 6 to some lower gear-- often 2nd or 4th) AND will signal the engine ECU to apply either 3 (low) or 6 (high) compression braking.
