Truck has good battery but

FROM LUSTYKID:

Ensure fuse link in system is not burned out first.

Check ignition switch circuit, ensure the ignition switch works, if good then you need to check starter solenoid to make sure it works. If solenoid is not the type above the starter (Fords have it separate) change solenoid, If its with the starter, change starter.

If you hear a click when you turn to start, and no turn over,,,change the starter.

How do you know it's good? Unless you've had a load test done on it, it could be bad. Sometimes a cell is bad in the battery. You can jump start it, and will run fine until you cut it off. I'd also run a amp check on your alternator. Your alter. may not be producing enough amps. Anything below 13 amps, could be the problem. Or a loose belt. Check everything throughly before buying another battery.