1986 buick century with no dash lights and headlights working?

If your 1986 Buick Century has no dash lights but the headlights are functioning, the issue may be related to the dashboard dimmer switch, a blown fuse, or a problem with the instrument cluster itself. First, check the dimmer switch to ensure it's not turned all the way down. Next, inspect the fuse box for any blown fuses related to the dashboard lighting. If those are fine, the problem may lie within the wiring or the instrument cluster, which may require further diagnosis.