2008 forester,i adj low beams to correct height now my hi beams down about ten ft in front of car

SOURCE: how do i change the low beam headlights on my 06

Hi, there is a round plastic "Bulb Housing Cover" the you will see the wires going into, you need to rotate this cover COUNTER CLOCKWISE and it will slide back about 4 inches. POOR Design on Subaru's end, you need small hands to reach around the cover and remove and install the ne bulb.
Next Step:
Remove the BLACK Wire Connector that goes into the bulb. There is a red wire as well, but the black wire is the one to remove. Remove the "Bulb Retention Spring" out of the way. Grasp the bulb by the metal end and remove with a slight twist and pull straight out. Reinstall new bulb. Do Not Touck the Glass on the Bulb as any skinoil can ruin the bulb, use a bit of paper towel or a clean cloth if you need to touch the glass. Reattach the Bulb Retention Clip Reattach the Black Wire. Reinstall the Bulb Housing Cover by rotating it Clockwise. Not too bad, took me about 3 minutes. Subaru could have made access a lot easier!!
Take care

SOURCE: i have a 2011 forester

it may be a wiring problem,it could be a bad earth wire connection or power wire connection, what appears to be happening is you have good lights one minute & the next minute they are bad,when they are bad is when there is a power drop in the system,you need to check all the wiring & connections to see if you can find where the problem is.......hope this helps......cheers.

SOURCE: 2008 forester has new battery and everything is hooked up correctly but the car has no 12v power at all

Well need more information to post a valid solution.
When you say there is no 12v power at all does this affect the whole car (engine not turning over, lights not coming on, etc.) or do you mean the 12v accessory outlets are not working.