Everything was going so good

spark tester?
lisle-20610__1-jpg.jpg
the wiring diagram
1685106594634.png

Some things that can go wrong.
If wire R6 (althernator output) contacts any J2 or J3 wire, the engine will keep running. R6 is always hot because its connected to the battery.
If J1 (power to key switch) shorts to J2 or J3, same thing.

Shop manual has the full wiring diagram. The diagram above is just a schematic of the main circuits of interest