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First use a battery charger to charge the battery, instead of a jump start. Second, with a complete dead battery you may want to pull the connection for the horn under the hood till the battery is completely charged.
The Security system will activate if the Battery is below standards. Have the battery checked. Even if you jump start it, as soon as the jumpers are removed the charging system may not work or the engine may die.
If you have another ignition key, try that. The ignition key has a Code in it and if it does not match the Codereader, it will not start.
How did you test the alternator? If you tested it by using a multimeter on the batteries while the jumper cables where still connected, then you were probably reading the alternator put out of the other vehicle if it was running as well. Or you read the combined volts of the batteries. Usually if a vehicle dies after removing the jumper cables then it is the alternator. I would use a multimeter to test the alternator while the explorer is running. It should be reading about 14 volts. The other possiblity could be the battery. You can voltage all day long, but if you dont have the required cold cranking amps then the truck wont start. You can take the battery and or the alternator into the autoparts store and get them tested for free.
I suspect you have a loose or corroded connection. you should be able to check voltage at relay and if good, jump across from cable coming from battery to terminal from ignition switch. or u can bypass the relay completely by using a jumper cable to go from battery pos to output cable on relay that goes to starter.
Your battery could have a few dead cell, with jumper cable hook up, try to start engine, if all light go dim to off, replace battery, will not take a charge, replacing battery will take care of your problem.
This sounds like it is either a bad battery with a possible dead cell or a bad solenoid. If you haven't done so try jumping the vehicle by connecting ground to the engine block and disconnecting the positive cable from the battery and connect the positive jumper cable to the positive cable directly. If the vehicle starts then the battery has a dead cell. If it starts and dies when the cable is disconnected you ahve a faulty alternator or charging circuit.
Sounds like connections or cables. They may appear to look good but if they are aftermarket terminal ends they get corrosion under the bolt down clamp that holds the wires in. If they are factory cables that are molded on to the ends of the wires the same thing can happen. The easiest and cheapest thing to try is to put aftermarket terminal ends on the cables. Make sure you wirebrush the ends of the cables after you strip them and tighten them evenly and securely. Also clean the battery side thoroughly. If this doesn't work check the starter relay. Its the first place the red cable bolts to after the battery. Check the connections and try putting a jumper wire between the battery positive cable and the small terminal marked with an "S". One of these solutions should take care of this.