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Re: Truck will not even crank over to start
Test for voltage at small wires on starter solenoid, by the stud on the starter, when someone trying to start. You should have power to it, or one of them, when key is cycled to start position, and none when you let go. If power there, my guess is your solenoid. May have to take starter off & bench test it. If no power to there, locate that relay you hear clicking,and check it, for constant power source going in, and one or more coming out when key cycled, which should be power source for wire at solenoid on starter.
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Try another starter and also try turning the crank bolt with a ratchet and socket to make sure that the crank isn't frozen in place. Do not leave the keys in the car when doing so. You don't want anyone messing around in the truck when trying that!
your battery may check out fine, being 5.9 liter take a big amperage to turn that starter over 12volt does not mean a thing, amperage is what count. Every auto part store they sell many types of battery and they all 12V but different amperage. Your battery may check out 12V but amperage may have gotten weak. Check all your negative ground that you have good contact to body chassis. You can also try to get a jump from other truck (friends) that has a higher or same amperage as yours to see if it turn over. using jumper cables connect positive cable straight to your positive post and the negative directly to your motor metal ground and see that will also assist the amperage to turn over that starter. This way we can truly eliminate the battery if it does not start. If that don't work than its you ground connections or positive contact. check both positive and negative cables from your battery making sure the wires is good. Inspect the ground wire to your starter making sure it has good contact. Oil and rust will make give a bad contact. If your hear the serenoid clicking when the key is turn over and you can hear the starter making a strong clicking noise to the flywheel but not able to turn your fly wheel, and we try to jump with addition battery increasing the amperage along with good starter, all the gound wires check out, chances are your motor may be lock up. The only way to check if your motor/flywheel is lock up, take all the spark plugs out that way it will reduce your compression, take a big close end box wrench and put it on the main crank pulley and try to turn the main crank pulley over by hand. Go from there and re-post and let us know, one of us will try to continue to walk you through it.
I believe that click you are hearing is your starter engaging but its not cranking your engine over. Your starter must first shoot out to engage your flywheel and then it should crank it. i suggest you get your starter tested to verify.