Regulator. Direct replacement to your original unit. Plug-and-play, direct fit, easy installation. No assembly required. Higher grade of electric components. Improved heat sink and charging capabilities. The quality exceeds the O.E.M. equipment. All products shipped are tested. Note: RMSTATOR has even included the opposite connector (main harness side), as they know these are often melted / corroded / defective and a major cause for repetitive electrical issues.