clearance lights don't work

[bourne367]

metal ground is old so circuit won,t complete.What is the best way to fix it.1976 dodge jamboree 20ft.Class C

[RV Wizard]

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.