Taillights and dash lights are out? - 2001 Subaru Forester

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First you need to determine if all lights in the back are out or just brakes lights or tail lights. Check fuses, taillights will have their own fuses. Could be a bad dash switch, which would be evident if brake lights work but not taillights.

I had the same problem, turned out to be trailer wiring harness.Removed harness and replaced fuses, now I can shift and all lights work.

seems that taillights and dash lights are on the same circuit, they did that years ago so that if your dash lights went out you knew that you had no taillights, chech the grounds for the taillights, and check for voltage at the socket, from there its a search for broken wires

There seems to be a unwritten rule that the tail lights are on the same wire as the dash board lights ... if you have no dash board lights, neither do you have tail lights. There is a blown fuse somewhere, your job is to find the wire causing the trouble and it is likely at a most inconvenient place near a hinge.

Good luck with your repair.

Turn on the hazard switch to check if the bulbs light up. If they do, the problem is probably with the headlight switch itself.

The taillights are commonly connected to the dash light circuit ( so you can be aware when they do not work ).
Start with the fuse box. Read carefully for the correct fuse to change. Sometimes they have a strange name associated with them. Turn the lights off before you change the fuse otherwise they may blow even if the circuit is OK. If it blows again you need to look further to find a shorted wire. ( Most likely in the boot, near the taillights, a wire has been crushed or damaged.

The fuse to the taillights/running lights?
It can't be a grounding problem if both taillights and dash don't work.
If only taillights don't work, it would be suspicious grounding.

Put in a radio lately? - you'll probably find that the fuse is blown for the dash lights; and the stereo is wired incorrectly - if no radio - then there is a control module that controls the lighting I think - put in fog lamps either? I'd bet it was either fog lights or radio incorrectly installed, or control unit. You'll find that the dash lights and tail lights are usually connected (on same circuit). Be sure to turn the key "on" and check both sides of all fuses with a test light. If that turns up nothing, then a wiring diagram and some time are required....

check for blown fuse they run off same fuse.