Joe Kriz wrote:
First of all, the small red wire with the yellow fuse holder and the small black wired with the black fuse holder should have absolutely nothing to do with starting the motor.

Sounds like it's time to get to know your wiring system.
You really need to find out where the other ends of those two small wires are attached.

Here is my guess.
The small red wire probably goes to a fuse/buss panel under the dash.
This gives power to all the accessories that are attached to that panel.

I have no idea about the black one and why anyone in the world would use a black color on the red terminal is beyond me. A red wire with fuse holder is available most anywhere and this should be changed out unless this actually goes to the negative terminal. But then, most negative wires are not fused.

The other guess would be that one of those small wires is shorted out somewhere and causing the spark.
Again, follow the wires and find out exactly where they go.