the coil has the spark plug wire coming out, as well as a single black wire. A bar passes through the coil which grounds to the frame. How does the coil wire produce electricity to the spark plug? The black wire coming out goes to ground, and another wire shares a bolt that is also used for multiple grounds using the coil bar. Is there not a hot wire that goes to the coil? Can someone help me make sense of this?

Also, is the small electrical chip-looking thing screwed to the frame by the coil the silicon rectifier?

Thanks,

a broke college student who can't afford the manual

you're right. after i posted this quesiton, i found an article that described the function of that black wire. it wasn't another ground, it was the wire coming from the points that produces the charge. i just forgot to update the question information. But i am still wondering if the circuit-board-thing is the silicon rectifier