... Or it could be the alternator. I'm surprised how similar the symptoms are for the two problems when you're talking about a vehicle. Especially a really old vehicle that already has a lot of, shall we say, personality.
For the second night this week, John's been stranded when he got off work and the Volvo wouldn't start. Both times, a jump start did the trick. After the first one, they ran by an auto parts place and asked them to check the battery and the alternator. Both checked out fine.
Then James took it out one night. It started right up, ran fine. He let it sit for hours while he was at an event, and drove it home. No problems.
Last night, it wouldn't start for John. He's frustrated that it's only doing it to him, of course. He got another jump, but when he got home he started telling us about the weird behavior of the Volvo on the drive home. Headlights dimmed and brightened, dash lights also behaved oddly... add in the radio cutting in and out (probably a loose wire), and what we suspect may be slightly fouled fuel injectors affecting acceleration, and the whole ride sounds like a scene from Supernatural.
It would be hard not to take that a little personally when the thing drives fine for everyone else and you're pretty sure you're not crazy. After a good night's sleep, I'm able to chuckle a bit. (It's likely an intermittent failure on the alternator, which won't show up unless you've got an hour to spare and can ask the parts place to do the long test. He's not crazy. And the car's not likely possessed.)
So today the boys will get to learn how to switch out the alternator. That's good stuff to know. I'm excited for them to do it again (three cars, all old - this isn't their first walk through). They don't particularly appreciate it at the moment, but one day, they will. You may get to the end of your life and think, "Whew, some of that was challenging," but you don't get to the end of your life and think, "I wish I hadn't been so capable!"