69 273 headlights wont turn on

If you need to replace the fusible link, this thread has pics and descriptions of removing the multi-connectors.
question on the main harness plug on firewall

If working on the harness you may want a roll of nonadhesive electical tape (harness tape) and if any of the original terminals need replacing, do a search here for Chrysler open barrel terminals so you can get the correct crimper and terminals.