Hi,
Have a 1970 LeSabre Convertible and having light issues. The low beam on driver's side works on low beam but goes out when you put the system on high beam. The other three light come on. Any answers? Just changed the bulb so it's not that. Thanks.

 

If you use a test light , you can verify if power is coming to the plug of the lamp that goes out when hi beam is selected. Once you determine that ,you go from there, we should be able to assist you once we know what we have and don't have, OK~ ?