The injector wiring harness has two purposes: first is to provide an electrical passage way from the engine valve cover gasket to each injector and the second purpose is to provide an electrical passage way from the engine valve cover gasket to each glow plug. There are two reasons to replace the injector wiring harness. The first is if the connection between the valve cover gasket and injector wiring harness becomes loose or seperated and the second is if there is a burnt electrical connection. The early model power-strokes have two electrical connections on the valve cover gasket and later models have only one.
1999-03 model Powerstroke engines
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