1986 Other Chevrolet Models Headlamps

If you don' have a manual a chevrolet manual for your year for chassis should take care of a lot of your issues. Having worked on Motor homes in the past, grounds are the largest problem and that would be where to start. On the running lights you will probably find one of the wires or all te ground wires are not very good. The bodies are aluminum so it loses grounds alot. The same with the headlights. You may have to put a ground from the battery to the frame and run grounds from there. Also if this has the floor type dimmer switch, push it in and see if any headlights come on. If they do, then clean the dimmer switch and connector and put dielectric grease on it and see if they work then as those would corrode and lose contact.