Truck was parked in yard for two weeks during rain and now won't start, battery is strong.

Will not *START* ... One possibility comes to mind .. IF the yard was sorta bumpy where truck was driven to its parking spot, the *inertia switch* (fuel pump cut off switch) may have tripped to the off position .. That is assuming that the starter is CRANKING the engine ok but the engine will not START. (?)

Above answer asks another question. Does the engine "Crank" or turn over and just not catch and start? If engine does not turn over, may not be battery, maybe starter itself. If engine does turn over we have lost one of the following, Ignition system (Spark), Fuel system, or compression. Loss of compression would be the last item to check, but loss of spark or fuel maybe due to a computer control issue that could be due to loss of a sensor. May need to have it towed in for a tech to diagnose. If we can be of any help, do not hesitate to call All Pro Automotive at (904) 241-4800