Hello Bourne367 and
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. Good luck, stay safe and keep us posted.
First stat at the battery negative post and insure that the cable terminal and post are clean and tight. Second be sure the cable itself is good, not corroded, broken strands or burnt. Find the attachment to the frame remove and clean this connection very well and re-connect. Test the lights and any circuits for the chassis side of the coach. Any circuit that does have a 12 vdc + but not a good ground will have to have the same inspection of connections or much easier just add another good ground conductor from a good ground to the loads.
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