89 headlight problem

There is a fault in the headlight circuit in my '89: The headlights come on with the headlight switch in the center and right positions even with the ignition turned off.
I have normally left the headlight switch in the right position, and leave it there after parking, but now the headlights stay on and drain the battery. When I turn on the headlights, the radio/clock display dims like the voltage is being pulled down. What would cause this? A stuck relay or something like that?
Thank you for any help.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.