Good info, thanks

Hopefully I won't ever get any problems...

I am in Texas and it just happened to me yesterday leaving a job. Had to drive about 15 miles in 4 low towing my trailer along the side of the road. Checked the codes that it threw (4wd switch circuit and speed sensor "A" circuit) Looked at the helms manuals and went out to mess with it and it was fine. One of those random ways my truck acts up sometimes. Thanks for the tips, I will be cleaning that ground up tonight.