Alan
Thanks for your input. I went back and looked at the motor plate later and mine says 18A, which sort of makes you wonder about my new switch that goes from 20-25. But wait - there's more. All I did yesterday after swapping out the switch was test the switch a dozen times or so - no cutting or tension on the blade. It turned on every time so I thought the problem was licked. Today I hit the switch a couple more times and all is well, so I start getting ready to cut some wood. I tension up the blade and set the fence up where I want it, then hit the switch. NOTHING. Just the terrible stench of the smoke coming out of my ears.
After calming down a bit I remembered your post and dialed up the switch all the way to 25A (this is before I read the 18A rating on the motor plate). Voila - it worked. Most of the time. I still had a case or two when it wouldn't turn on, but for the most part it was OK. At least this time when it wouldn't start there was a faint but clearly audible sound indicating it was trying to start the motor - something I hadn't heard at all with the old switch or with the new switch dialed in at 20A. This just keeps getting wierder. Apparently tensioning the blade provided just enough load that I couldn't start it up set at 20A ?? The cutting I was doing was just through 3/4 clear mahagony about 2' long - not any major resawing. But I'd do a few cuts with shutoffs in-between then get a no-start again. A couple of cycles of off/on/off/on and I could get it to start again. So my experience says I should dial the switch up even higher if I could and all would be well, but the 18A rating on the motor says otherwise. I checked the voltage again today and it was at 237V so no major change. Looks like the story on this fix isn't quite over yet.