Parked overnight now truck doesn’t start.

[Toolguy]

My 2 cents. Check the wire end to terminal fittings. Corrosion or old bad fittings? 18 years is a long time for wires in an open environment. Unbolt the cable ends and hold the terminal end and the wire going to it and give it a slight twist. Should only do this where you can service your truck. Good luck.