I haven't used my well pump all Summer (since we've had to much rain I've not needed it). This last week or so things have really dried up and I decided I should water the grass. With sitting that long I went ahead and re-primed the pump (I know from the past that it can only hold prime for about 2 weeks of disuse). No problems cycling it several times while priming.
I then let it finish refilling the tank while I ran the hoses out in the yard. When it clicked off, instead of the usual "click"/"whirrrrrr" sound (from the motor spinning down) it made a "click"/"pssssshffft" sound. I didn't think a lot of it as I had the primary valve open and sometimes there's a little leakage around the secondaries. However, after attaching the hoses and opening the water valves the tank drained without the pump ever coming back on.
So far I've checked power to that circuit, and tapped the control module to see if it might perhaps be a stuck relay. What should I look at next? Pressure switch (if so, how do I test it?)? Bad motor perhaps? Any particular common point of failure (especially with that odd sound)?