The starter relay is a necessary component in all electric start systems to reduce the current through the starter button preventing it from melting. 12 Volt OE style replacement relay. This 15 amp micro relay is fully potted giving it a water-tight seal and features a diode to ensure a smooth transition between states when the relay is switched such that any transient voltage spike is suppressed. Fits 2000-2011 Harley Big Twin Softail, Dyna, Electra Glide, Street Glide, Road Glide, Road King & 2002-2005 V-Rod VRSC Models. Replaces HD# 31522-00, 31522-00B, 31522-00C Measures: 7/8" x 9/16" x 1"