I have an S5 GXL/T2 swap. After 5 months I finally got my 7 running correctly. But, it only ran correctly for about 3 days. At first when it was idling the engine would just quit running. It would just shut off, like I turned the key off The next day it was really hard to start but once it started it seemed to run OK but would still just quit running. Now, it will not start and there is no spark. I know I have 12 v at the leading coil. I can't find anything like this by searching.

ash

 

does your rpm needle bounce when you try cranking it? if so, your main relay is good, if not, you have a bad main relay and your trailing coil is not getting spark. also, check your 15 amp engine fuse under the dash by the driver side kick panel. replace if necessary.

 

I pulled the main relay and checked it with a 12v jumper. Relay does not click and no continuity is noted. I guess its time for a new relay.
Thanks for the help pointing me in the correct direction.