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Yes that was suspect also. I tested the harness all the way from the inside of the transfer case to the bulkhead connector. Not only resistance but made sure there was no cross connection between wires and made sure each wire would carry enough amperage to light a lmtv headlight.

I will look at them carefully. Checked for corrosion and breaks none found. Also checked to make sure there was no shorts to other wires in the bundle and that the wires could carry current. So far the wires look great.

Yes I pulled the speed sensor and measured it on the bench. It was 9.5 ohms. Measuring thru the pass thru on the second truck the speed sensor measured 271 ohms which is in range. My center diff solenoid also measures in the 3 ohm range.

My 2001 m1078 a1 speedometer stopped working and locked into a gear. Tested the speed sensor and got 9.5 ohms at 70 degrees. My 2004 truck tested 271 ohms. Looks like I need an output speed sensor. The one located inside the transfer case. Has anyone tested the solenoid for c7...