Mercury - Quicksilver Ignition Breaker Point Set Ignition System Component Delco Conventional 34235T. Overview. A reliable spark starts here. The Mercury Marine 34235T Quicksilver Ignition Breaker Point Set is designed for General Motors 4- and 6-cylinder marine engines equipped with Delco conventional ignition systems. These precision-engineered points open and close with exact timing, ensuring your engine gets a strong, consistent spark at every revolution. Built from corrosion-resistant mater