Replaced bulb in our passenger side headlight for the low beam and it just comes on and off at random times. Hitting the outside of the headlight turns it back on for a bit, but then it goes off again. Suggestions?

SOURCE: 2007 Forrester - headlight bulb good but not lighting

You will need to look at the plug for the headlight. If it looks good, I would look for the headlight low beam fuse.

SOURCE: 2001 subaru outback headlight not working

chapmnfarm: your head lights use a "2" fuse system.
one for the left and one for the right.
The fuse box you are looking for is under the hood on the passenger's side. It is a black box roughly 8 inches long and 4-5 inches wide. When you remove the cover, you will see fuses and relays. What you are looking for is the section in the box which has a cluster of 7 fuses. 3 in one row and 4 in the other. On the outer parameter are two relays. The fuses you are interested in are located in the row of 4 fuses, with the two closest to the "L" shaped part of the box. Both of those should be 15 amp fuses.
The fuse below those should be a 20 amp which is the lighting switch and the one below it is a 15 amp which is for the interior lights and the clock.
Check your harness grounds in the engine compartment near the area you have the problem. There are ground wires which come out of the harness on both sides of the core support. The wires are black in color and have "EYES" crimped onto the ends of the wires. Both of them will probably be located about 4-6 inches below the upper tie bar on each side of the radiator. Odds are that the eyes will be large enough to pass a 6mm bolt through.
I hope what I have given you will resolve your problem. Lem me know,,good luck>>>>>>>>>>>>>>>

SOURCE: 2007 Subaru Outback wagon headlights

there are individual fuses for each side headlamps,both are 15amp located in fuse box underhood,check em out

Testimonial: "thanks. I figured out my trouble, I just did not get the bulbs seated right. it was just a simple mistake while standing on my head to get them in.thx"

SOURCE: headlight low beam

Test to see if you have voltage at the bulb connector in low beam position. I'd almost bet that if there is no voltage there for the low beams that you have a bad high/low switch.

SOURCE: fog lights and high beams work, but not the low beams

most likely the hi lo switch