2001 F-150 6cyl 2Wd 120K miles. Truck starts excellent in morning. After driving to 3-4 job sites, truck will not start. Soft click sound, no turn of flywheel. Jump 'start celonoid' on firewall with screwdriver, no effect. Battery strong, lights, bells, whistles all functional. If the truck sits for 30-45 minutes....starts immediately with first turn of key. Happens every day once engine gets hot.