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bad alternator possible or bad battery..even though its new that battery can be bad. I would take a volt meter and with the engine running check the volts of the battery..If the volts are 12 you need to replace alternator, if volts are 14 you need to check the battery. to check the battery hold the volt meter to the battery and have someone start the car..while the starter is cranking battery volts should not drop below 10volts.if they do your battery is bad.
this may sound funny but i had an old dodge car that did that exact thing....turns out that i had to replace or repair the ground straps and also the cables to the battery and starter....it was fine after that.
first of all make sure battery is fully charged auto zone will test batteries for free but if you can get it jumped and running while it is running take the positive side cable off the battery and if it dies then it is the alternator and also look at the condition of the drive belt but if you do all this and the truck does not start spray very little starter fluid in the throttle body if it starts ask yourself when was last time I changed the fuel filter and also have someone to be back by the gas tank to see if you can hear the pump and check out the fuel pump relay which is normally under the hood on the drivers side before changing the fuel pump
before replacing the starter get a volt meter and test the voltage coming out of the voltage regulator which the power comes from the battery to the regulator down to the starter also make sure all wires on the starter are clean and what I mean is from rust because I had an f150 that did the same thing