A method of determining the location of splices and of calculating event start and end locations, the type of loss estimate, and LSA cursors locations and lengths, which will be used to calculate the power loss at splices in optic fibers in a cable. The light assembly is crescent shaped and is wired to the right turn signal circuit to light automatically with the turn signal, and may be wired to illuminate automatically when a greater than 40 degree right turn is made. The lastmentioned outled is connected to a vacuum source and the particle outlet for cleaned air.