I have 93 jcb sitemaster serial pe410022 with the perkins ab turbo motor, and have recently torn off the head for what was thought to be a blown head gasket. But when reinstalling new parts and putting it back together I noticed a plug that I had forgotten. The numbers for the wires are 600CF and 402, and it is located near the intake and on the same harness as the blade connector for the fuel injector in the intake. Any help is appreciated