A harness connector having a header assembly that includes a header housing that extends between a plug end and a mounting end. The header housing holds header contacts. Optionally, the header housing may be mounted to a printed circuit board at the mounting end with the header contacts being electrically connected to the printed circuit board. One or more plug assemblies are received in the plug end of the header housing along a plug axis. The plug assembly includes a plug housing holding receptacle terminals. The receptacle terminals extend along terminal axes parallel to the plug axis between mating ends and terminating ends. The mating ends are mated with corresponding header contacts. The terminating ends have insulation displacement contacts configured to receive, and be electrically connected to, corresponding wires. The wires extend from the insulation displacement contacts along wire axes that are generally perpendicular to the terminal axes.