You can also buy continuity testers at just about any auto parts store. They're not the same as 12v test lights, but they're similar. You'll need one that's got its own power source built in, and that's why a voltmeter or multi-meter works well for this. They're under $15. Some continuity testers are under $5. You could make your own, but I won't get into that. You have an electrical problem, and if it's not a damaged harness, replace your distributor with one from a running car and see if that helps.