It's always something with these jalopies, isn't it.
After installing my new speedometer and fixing the gauge lights, I took Ol' Roy for a nighttime spin. Everything was hunky Dory.
After I got back I parked and then attempted to restart the engine after a short time.
Engine turned over extremely slowly with a couple attempts like the battery was low. Then it didn't turn over at all.
When I tested the battery with a voltmeter, it registered 6.4v or so. That seems like normal full charge. The (+) side of the coil registered 5.6v with the ignition switch turned on.
Manually engaging the starter lever made no difference. Starter didn't turn at all.
Battery is about 3 years old, maybe 4.
I'll clean all the connections but this truck gets used a lot and doesn't sit around so corrosion doesn't seem likely.
