Hello Terry W. and welcome to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums.
Bad grounds are one of the easier faults to correct since you can't have too many of them. Most of the time when I find a bad ground (especially on smaller circuits) I just add a good ground instead of waste time trying to find out where and why it went bad. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7