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Today the starter just clicks once and then nothing. Battery is fully charged. Connections appear fine. What's my problem here? Solenoid??
Could be solenoid but other things that duplicate this same symptom is a battery cable that oxidized between the terminal and post connection and now has a high resistance or a battery where one of the cells suddenly died. Both can happen fast and without much notice.
Using a post and terminal brush to clean the terminals and posts is easy, relatively fast, and if it has been a while since the terminals were taken off the posts, worth doing even if not the current cause of the problem.
To diagnose a weak or dead cell without a decent battery load testing tool will be more difficult. A regular voltmeter does not have enough load so it may still read a near normal voltage but that might only be a surface charge even with a dead cell. If you placed the probes on a clean and bright spot on the actual battery posts -- not the cable ends -- and had someone crank the engine, if the voltage drops down by more than a volt or so that would be an indication of a weak battery or bad cell.
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