Help!!! no low beams and dim high beams

[1966gmc]

I never drive the truck at night but would like to every once and awhile.Anywhoo,I noticed a few weeks ago that my low beam light on the passenger side was dim and the driver side does not come on.If I turn on the high beams,the low beam on the drivers side will light up and is quite bright while the others are dim.I got fooling around with the passenger side tonight and now the low beams do not work until you turn on the high beams.All other lights work(tails,brake and turn signals) fine.
What in the hell is goin on? A bad ground somewhere?

Please help