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Does it die after sitting for a longer period of time? or will it happen immediately after driving?
What kind of electrical items do you have in the truck? All stock stuff or a BIG stereo, off road lights, seat heater/ massager?
To check for a battery drain hook the test light clip to a GOOD ground and disconnect the negative cable from the battery while touching the probe of the test light to the battery neg. term. If the light lights up with the cable disconnected than you have a drain running the battery down while the truck is shut off.With the engine running carefully check the voltage at the alt output wire with the pos. voltmeter lead and touching the neg v. meter lead to the alt housing. Should be 13.5v. to 14.5v. Now with the pos v. meter lead still on the output term. of the alt. touch the neg. v. meter lead to the positive battery terminal it should show almost no voltage. If it shows more than 1/4 to 1/2 a volt you have to much drop in the charge wire.(bad connection or overloaded wire) Touch the pos. v. meter lead to the neg. of the battery and the neg. v. meter lead to the alt housing should be almost zero volts. If not you have drop in the neg side. (same deal)Let us know, Matt