hi i have a 2000 chevy blazer my transfer case module is clicking when the car is shut off. when i turn it back on it stop clicking...everytime i shut the car off it starts clicking and wont stop. after 2 days of not driving the battery is dead.. is the module bad or something else? i unpluge it for tonight to see if battery stop draining.. any help thanks guys

 

Remove the 4wd switch assembly from the dash and un plug the connectors. See if it stops the clicking. If it does, then the problem is in the switches....if not, then something is not right with the TCCM. You could always pull the fuse and eliminate the power drain.