No spark at distributor

[cp5491r]

Thanks all. I got back to it today and I think I just have a bad switch that isn't consistent. I had good voltage at coil, to ignition switch and eventually back to ignition cable. Screwed it into distributor and had voltage at the points swing arm. This is all with the ignition panel unscrewed from the dash so there is not short on the switch. I shut off the switch to put everything back together (ignition cable back into terminal box, terminal cover back on) and tried to start it- turned over but no attempt to start. I checked again and not voltage at points, voltage into the switch (sometimes) but not out to ignition cable.
I think it just must be a bad switch... sound correct??
Thanks.