If you have a multi-meter I would suggest using the service manual (available on this forum). I would start with the illumination control module/headlamp switch.
Section 8L(Pg 1067). Starts the troubleshooting for each of your lamp issues. I would check every fuse and connection on the illumination control module/headlamp switch to make sure there is not any corrosion.
Pg 3917 is a good illustration on how to remove/access the illumination control/headlamp switch.
I hope this helped. If you have further questions please ask.
I placed a link from ebay for another switch.
https://www.ebay.com/sch/i.html?_fro...38AA&_osacat=0