Gmc9305

Hello, I have an 2002 C3500 cab and chassis dump truck that has been sitting for about 6 years. The fuel pumps went bad and need replaced. I need to get the bed up to allow for easier access to the top of the tanks. I found on youtube that I can jump out the clutch pedal position switch so i can crank the engine with the PTO engaged to slowly raise the bad. What I found is to put a jumper between the A and C position with the D and F positions on the switch plug. Does this sound right? I don't want to fry anything.