Do you have any history on this vehicle?
Was it running last week and just stopped?
Has it been sitting for months and you are trying to get it started?
The red wire with light green stripe is the Positive wire at the Coil
Diagram here:
https://therangerstation.com/tech_library/EDiagrams/files/Diagrams_StartIgnition83to882_9.JPG
R/LG = red/light green stripe, giving this wire 12volts from battery will keep the whole spark system powered regardless of ignition switch position
In the old days this was called "hot wiring" a car, lol
What makes any ignition coil Spark is when you CUT either it's 12volt(+) or Ground(-)
Most spark systems leave 12v on all the time(key on) and cut the Ground to the coil to make it spark, that's from the old days of having Points inside the distributor, just less of a chance of 12v shorts if you use the ground instead
So your 1 spark means the coil is getting powered up, has both 12v and ground, with key on, but one of these is being cut off(first spark) and then not hooked back up for the next spark
If you have a 12v test light or a volt meter you can test if there is 12v at the coil with key on, there will be, and then see if 12volts stays on with key turned to START, it will actually drop down to 10v or so with starter motor activated, but that's fine