At the beginning of the summer,my 58 Buick Super 364 cid nail head started acting up. After engine was hot and running and I pulled into gas station and shut off engine, it would not restart. At this point,not all the time, now, always does it. I could jumper the solenoid(after replacing)and it would start. After sitting for forever, it would then have cooled down and restart. After engine was hot, there was no voltage at starting relay. Jumpered accelerator switch and neutral safety switch(to eliminate them) and nothing at start relay until cool down , then with ign. sw. on, there was 12 volts at relay and it starts. Any ideas??? Still working to get car pics from my comp to this site.