83 300sd headlight issue
 

I've been riding my bike so much lately that I have been neglecting the old girl.
Last night I noticed my front left headlight was out. This AM I bought another and put it in and it still didn't work, also I noticed my fog lights are not working, as well as my RIGHT side front parking light. All my fuses are good, replacing the front left 10a fuse didn't change a thing. I de-greased all the wiring in the front left engine bay as they were dirty and oily.
What next? A bad ground somewhere perhaps?
I don't relish the thought of taking it into a shop for something like this that in theory I should be able to figure out on my own, and yet at this point I am stumped. :confused:

If you have a voltmeter OR test light, you can check for power at the fuses & at the headlight.