Truck has good battery but no power

The clicking is a common symptom of a drained battery or bad cable connections. For the drained problem, follow the smaller battery positive wire to the under-hood fuse box, and be sure that connection is clean and tight. Follow the smaller battery negative wire to the body and be sure that connection is tight and not rusty. If we need to go further, we will need a voltmeter to take a series of voltage measurements.

Yes. I read this quite often as a clue to low system voltage. Even though you turned some circuits off with the ignition switch, some computers need up to twenty minutes to go to "sleep" mode. Until that happens, they can be checking the fuel vapor recovery system for leaks, and running other self-tests. It is not uncommon for the system to draw three amps for that twenty minutes, and that is enough to cause low system voltage when there is a bad battery cable connection or a run-down battery. That smaller battery positive wire I mentioned handles most of the truck's current except for the starter. That is why given the multiple symptoms, that fuse box connection is a common problem on all car brands, and is related to both symptoms.

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