WHY AM I GETTING POWER TO THE TRANSFER CASE MODULE AFTER,I SHUT THE ENGINE OFF?

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TRANSFER CASE IS SHIFTING TO 4WDL. IT TRIED TO SHIFT TO 4WH LIGHT BLINKS FOR ABOUT 10 SECOUNDS AND THE SHIFTS BACK TO 4WDL. WHEN I TURN THE ENGINE OFF. I HEAR A CLICKING SOUND LIKE A RELAY TRIPPING,IT KEEPS DOING THIS UNDIL I PULLED THE FUSE. I CHECK THE FUSE SLOT WITH VOLTAGE METER AND IT HAS 12V.ON THAT CIRCIT. SO I HAVE A SPIKE,WERE IS IT COMING FROM. I NEED THE WIRING DIAGRAM FOR THIS TRUCK. HOW WOULD I GET THIS? THANK YOU