Thanks buoymaker, klhansen and bartamos for the great insight and suggestions. Really appreciate your input!
Knowing that the starter gets power directly from the battery is helpful. I'll start by getting the battery tested. Now that I think about it, the only thing that has changed since I last drove the truck (3 weeks ago) is a trickle charger - I added a trickle charger because I don't drive the truck much in the winter months. Now I'm wondering if the trickle charger damaged the battery, even though it's supposed to not overcharge batteries. I'm wondering if that's what happened, and now the battery isn't capable of producing the current for a starter motor, but is still able to illuminate lamps, etc.
I'll report back. Thanks again for your help,
Billy
