Mine doesn't work either even after the service manual suggested moving the rockers numerous times to clean contacts off. I haven't decided if it is worth the money to replace the circuit board or whole clock. If anyone knows a source and/or replacement cost, I might be interested in doing the repair on mine.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system