First check continuity of the grid...don't know what the resistance should be but open is bad...
have you checked for power to the grid?
Is the Relay clunking(mine always made a pretty loud actuation noise) - if not check for power to the relay. Test for a signal to the switching side of the relay (low amperage side)


'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60
'01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust,
'05 Dodge Magnum R/T - Too Much to list
'60 Willys CJ5
'01 International LPX - Project,DT466, Allison
'64 Plymouth Valiant, Inj 528 Hemi, 2spd