Do you have a device that reads out the resistance? If so and you see 9.9 either the connection is not right or just a bad coil. Also sometimes if one tightens the tank too much it can cause it to get out of spec and not fire (this is on VW mods). I have had coils last 2 minutes and some for weeks. When the flavor starts to drop is usually a good sign it needs cleaned or replaced. Also if you can see the
juice turn dark is another way to tell if the coil is getting dirty.....Provided the
juice is a light color to start out with...
Change to a new coil and see if it fires up.