Just completed my first cam unit. Suprised myself too (I have four thumbs), everything worked right the first time I tested it. Used a seperate switch for battery power and a dpdt (with center off position) switch for the camera and walk test light. Everything appeared to be working fine yesterday but today as soon as I turn the power switch to the on position the camera flashes. It does this when the camera/walk test light switch is in the on or off position but not in the walk test position. Any ideas as to whats going on?