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Hello, does it have the 6 or 8 cylinder engine?
Hello, the first thing is to check that the battery connections are tight and clean, no corrosion or cracked terminals. A single click when turning the key is usually a bad starter which pretty common on these V8 engines.
Ok, that would indicate a voltage loss between the battery and the starter, do you happen to have a voltmeter? Have you tried a jumper battery or connect a jumper from another car?
Ok, connect the voltmeter to the battery, it should be a little over 12 volts then try to start it and see how much the voltmeter drops down, I still think this is a starter problem but lets see what the voltage does when the starter is trying to engage.
That's pot too bad, I still think the starter is the problem but I'm going to opt out and see if another expert will confirm my diagnosis.