[Tommy]

Most American auto parts stores sell an inexpensive spark tester. It's a small open plastic box with electrodes screwed into opposite ends. You attach a spark plug wire to one electrode and connect the other electrode to the plug with a jumper cable. With the electrodes adjusted the proper distance apart, have someone crank over the engine while you observe the tester. If there is enough voltage for the spark to jump from one electrode across the gap to the other, you likely have enough spark to fire the plugs. If not, you have narrowed down the problem.