This is a complete wiring harness that will replace your old harness perfectly, and easily. All wires are numbered and by following the instructions by the numbers, you'll be amazed at how easy this harness is to install! Wires are made of copper, correctly colored and are coated in a modern pvc plastic for durability. Harnesses come set up for the original type generator system unless specified. Updated alternator systems require an additional alternator conversion wiring unless specified.