I’m helping a friend rewire his ‘93 T-100 after a 3.4 swap, I managed to reconnect the vacuum lines to the ADD but I couldn’t find which connector on the harness goes to the ADD switch on the front differential. I still have the short extension with the two green wires the 1993 but I cannot find where to connect it. If someone could send me a picture of his harness routing, , the connector and the wire colors on a T100 with a 3.4, I’d appreciate. I cannot find info in the shop manual and I can’t find the electrical manual for 1995 or 1996. The 4WD works but the 4WD light doesn’t come on in the cluster when it’s engaged. I have found a mystery connector that goes through a white plastic 90° elbow near it’s end near the relocated battery and fuse box on the driver side but it doesn’t seem to work when connected with jumpers from the old harness. It has a green and a red wire. I think on the ‘93 it was green/yellow and pink/blue.

Herr’s the part of the 1993 harness with the connector.





Here’s the connector that I tried from the 1995-96 harness. I couldn’t find a use for it!