1986 Chevy S-10

. It's like the rain has done something to his battery

What happens when you turn the key and try to start the engine?

If the answer is, "Nothing, " you should check the battery, battery terminals, battery cables and ignition circuit to make sure voltage is reaching the starter. If the battery is low or has corroded terminals or loose cable connections, the starter may not crank because of low voltage. If the solenoid that energizes the starter motor is faulty or has loose electrical connections, it will prevent the starter from cranking, too. A faulty ignition switch, park/neutral safety switch on the transmission linkage, clutch safety switch on the clutch pedal or a wiring problem are other faults that can also prevent a starter from cranking.