I finally had time to crawl under the bus and check things about the bus not starting. I started cleaning the grease up in the area some, and suddenly, sparks were flying.
After getting the area cleaned up more carefully, I found that two of the wires had been rubbing together and were shorting out. So, wrapped a little electrical tape around it until I can address it further and see if that corrects the problem. I’ve driven around for a few weeks, and it has started every time. Hopefully, that solves the problem.