Igniter problems. Plz help?
 

When i put a test light to the pos battery terminal and to the neg iginter screw it lights up i have someone crank it. Flashs for a few cranks then no light at all.. i try it again later light turns on crank it flashs for a few cranks then no light at all ive replaced the coil and i know its getting fuel ?? Is it the igniter or something else??