on my dads 02 the lift wont turn on all the time, i just replaced it with the fass upgrade that bolts in the factory location, is there a crank sensor or something that could go bad and cause it not to turn on? sometimes it will work and others it wont turn on no matter how much cranking you do

 

do a test for us

turn key on but dont crank................time how long the FaSS will run

bump the starter but dont start..............time the FASS run

let us know eh