Truck won't crank/start on 1994 Ford Ranger

When I attempted to start my truck this morning, the only response was the "click" of the starter relay in the engine compartment - no apparent response from the starter/solenoid! Relatively new battery is fully charged and starter/solenoid was replaced only 6 months ago. I suspect solenoid/contacts/related connections/wiring, etc. What say you, before I attempt more detailed diagnostics??

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2 answers
Start with making sure the the terminal connections at the battery are clean and tight, then make sure the connection at the starter is tight
How do you know the battery is good?