Grounding problem?

I lost the driver's side head light last week. Replaced it. Headlight went out again a few days later, along with radio shutting off, antenna retracting, headlight(s) fluttering. Battery, altenator, and starter checked out good on voltage meter. Do I have a short in my wiring, or a grounding issue? All connections seem to be tight and fuses are good.???
Thanks for your time.