comment on the noise after turning off your truck, depending on how your truck is set up (model) you are hearing the retained power relays turning off ex. after your key is turned off a timer starts you still have power to your windows and various other components until 1 you open the door or 2 the time runs out on the timer. when the time runs out on the timer the computer starts shutting things off and you hear the relays turning off. your dealer can adjust retained power settings by useing the consult scantool however this is limited usually to off or on depending on model. any ?'s you can shoot me an e-mail
intruder8000@juno.com