I can't tell you sepcifically but it's been my experience that the pin that erodes in a connector generally has current running through it nearly all the time. You ought to be able to find a piece of solid copper wire to insert in the pin's hole to act as a jumper for testing purposes, it may get the truck started and tell you if that's the actual problem before buying a new harness. I've made repairs like this on a plow harness and have been able to finish a season with it.