86 HB pickup won't start- no fire

I changed the distributor & rotor & coil still no spark. I'm not a great mechanic but understand most things. I have a haynes manual but am having a hard time diagnosing the problem. Engine turns over good & rotor is turning so I know its not the timing chain.Any & all help welcomed. Truck just died while driving.

Might be in your ingition switch. Try running a wire from the pos battery terminal to the pos side on the coil and see if you get any fire if you do its your switch

not sure which is the pos terminal on the coil and once i do this am i still using the key to look for a spark