[grizmo]

I've been building a '67 327 camaro. I have a brand new accel pointless distributor and coil. Started the motor for the first time. Ran 20 minutes and then motor died. No spark to plugs. If I let it cool, the motor will start again, but will only run for 20 minutes. Seems like things are getting hot. Replaced new coil with another new coil thinking it was defective, but having same problem. Also replaced a new modulator in the distributor with another new one, same problem. Checked oms on pickup in coil, tested 540. When the car won't start I tried using a testing light on the negative side of the coil, have solid light when cranking motor over. I have a new american auto wire wiring harness. Any suggestions.
Very frustrated!!!!

[bowtieguyss]

Where do you have coil mounted? Sometimes remote location such as firewall helps.

[T-bucket23]

If you have a solid light on the negative coil terminal your distributor is not working. I would be suspicious of the module or you have a bad connection that the heat is affecting.
I have an ignition troubleshooting article in the WIKI, you may want to look at it.
It can be found Here

It refers to points but the theory is the same.