Driving in to work this morning my volt gauge dropped onto the bottom peg. It ran fine and the lights were a little dim but still good enough to not stop. The truck starts up and runs fine every time, but after about a minute of driving it drops to zero on the gauge again. I checked for bad connections and didn’t find any. Sounds like alternator to me. Ideas?

I didn’t do that, but when it’s running if I disconnect the battery the engine dies. That tells me it’s the alternator. I could be wrong.

I was afraid of that but a new alternator seems to have fixed it. The thing that threw me was, I would expect the gauge to read 12 volts if the alt wasn’t charging, not on the bottom peg.