Subaru 2009 forrester electrical

I'd recommend grabbing a shop manual from ebay ($5-$10) and finding the wiring schematics and tracing where the grounds are behind the dash and/or engine bay. Have you had any spills / leaks / accidents? Does the battery go dead over night?

Hmmm...unlikely that BOTH high and low beam bulbs are shot, but of course start there if their failure wasn't simultaneous. Check fuses too, but it's usually the bulbs. The cig lighter is tied to the overhead cabin light. Does the light work? If not, then it's likely the fuse, as they often fail with smokers' cars. As well, if someone swapped a radio or vent control they may have forgotten to plug the cig lighter wire back onto the rear plug. Re the wipers, I'd remove the column plastic covers and remove, clean, and reattach the harness connector on that switch assy. Pretty rare for that column switch to fail, but it's an easy swap. Have fun. Ern TSG/B PS There will NOT be any trouble codes for these things, as they're not in the running nor emissions controls.