My Jeep Liberty was just recently driven and then a short time later when I went to use it, the engine would not even crank. I checked the battery and that is okay. The gauges all light but there is nothing when you turn the key. I had a similar problem about 20 years ago on a Chevy and it was found to be the "Neutral Safety Switch", can this be the problem with the Liberty? Its been a long time since I did any major work on any of my vehicles so I'm not an expert by any means so be specific in your details.
I know you said that the battery is good...however, did you put a volt meter on it and verify that it has 12volts there? I always begin any electrical testing by both verifying voltage and load testing the battery (200amp load for 15seconds...voltage should return to 12 immediately after load is removed and should not drop lower than 9.5 during test)
I'm sure you removed and cleaned the terminals and posts...correct? Even though it's newer than what you worked on, safety switch if bad, generally will work in neutral as well as park. Most times you can change shift positions and start it. Do simple "flow test" check voltage in and out of ignition switch, safety switch, starter relay and at starter itself (12v at the main terminal, 12v at the trigger wire with key turned to start position.) Also check all main fuses in the power distribution center near the battery. Most times, you will not need to do all these tests before you find the problem.
It could possibly be a bad connection onto battery terminals, they can corrode while sitting around.
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