Continuing with this thread, I had some body work done on the pathy to get rid if the rust in the rear wheel wells and the tailgate. It looks great! Will post pics in another thread.
After getting it back, I noticed that the ABS/SLIP/VDC light was back on. My trusty old mechanic had discovered to tone ring was very dirty, and he cleaned it. This seemed to work, and lined up with the code I was getting, C1106.
However, upon further inspection, there does appear to be some damage on the wire harness itself. See attached pic. I have a feeling that this hole in the insulation allows moisture in, and causes a short which throws a code.
Here's what it does. You start driving, and the ABS/SLIP/VDC lights usually turn off within about 50 feet. Usually you can then drive for quite some time. However, if on the highway at cruising speed, and you set the cruise, you will be able to detect some 'bumping' or jerking. This causes the cruise to turn off. And usually, the ABS/SLIP/VDC light turns on shortly thereafter. You can even see the slip light flicker every so often.
There have been a few times this didn't happen, or the lights didn't turn off, or the lights turned back on right aways. Hence the frequent use of the word 'usually'. Probably common is sorting out these stupid electrical gremlins.
In any case, I see 2 possibilities:
1. Since I can see a hole in the insulation, cut the insulation there, repair the short with electrical tape/shrink and then seal with silicone and see if that does the trick? I seem to recall though, that ABS harnesses don't work well after splicing, so I'd have to avoid cutting it. Thoughts?
2. Replace rear ABS harness. Nissan sells it on the Courtesy website PN 47900-5X01A ABS Sensor Wire for close to $300. I see there are aftermarket harnesses available for around $50 less than this.
The truck is getting up in years/miles, but now after fixing the body, it would be a waste to not have a functioning ABS/VDC system, as I find this one of the best features of this truck.
Pic 1 - Picture of both tone rings and sensors
Pic 2 - Picture of the sensor position and condition
Pic 3 - Picture of the harness with the damage highlighted
https://photos.app.goo.gl/OoKXF13MiT0sLeiq1