just un plug the wire off one injector, take the side marker bulb out of the head light, stick the ends of the bulb into the injector plug, or use a test light. turn the key it should light up, if you crank the engine it should flash. at least they flash when its running i know that much.

if it does not light up or flash, you need to start checking your wires for damage or something else along them lines. it worked before you took it apart, so its something you touched. missed plug ect.