[MOSFET]

As many of my questions to this group often are, this doesn't exactly have
anything to do with car audio. HOWEVER, I happen to know many of you know
TONS about a car's electrical system. More than I do.

Here's my problem, my 1999 Subaru Forrester has a new problem where the
tail-lights and front running lights remain on even when switched off and
the key removed. I have to disconnect the battery (which I HATE doing as I
lose all my presets on my Alpine like crossover settings, EQ, station
presets, ect., though for some reason my Sirius presets remain, hmmm) every
time I turn the car off or I'll run the battery dead (I have 5 farads of
capacitance so when I disconnect the neg. terminal of my battery, it's funny
because the lights will stay on for several seconds, and then just
eventually dim out). Of course my wife is convinced I'm responsible because
of all the aftermarket gear and wiring I have added to the car. But it
started just out of the blue, I hadn't done anything to it recently.

Any ideas as to where to look first for a problem? I have a pretty good
multimeter so all ideas are welcome.

Thanks guys,
Nick aka MOSFET