Mercury - System Link Reset Harness SC100 Voltage Stabilizer 898289T42. Overview. SC100 gauges can momentarily drop out when a weak battery sags during engine start. The Mercury 898289T42 System Link Reset Harness keeps that from happening. It provides a clean, steady feed that helps the gauge recover instantly after those quick voltage dips, so the display stays active and readable instead of rebooting every time the engine turns over.. Key Features. Voltage Drop Protection - Helps SC100 gauges