2 things

FYI, shop and garage tools is not a good place to post this

Most likely from your description is dimmer switch.

Could be headlight switch going bad, or bad connection in the bulkhead connector

Go here and download a free factory manual

http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617

More here

http://www.mymopar.com/index.php?pid=31