47-55.1 Question for those (much) smarter than I

[Melnickta]

Back in December, I thought my battery was dead since the truck wouldn't start even after a charge. Got the new battery in and everything worked great.

Fast-forward to this weekend...truck is doing the same thing. Starter motor will make one feeble 1/2 attempt and then nothing. Lights won't come on either.

I know these old trucks aren't that complicated. What and in what order should I troubleshoot?