Tail lights are staying on?

I went out to the shed the other night where I keep it. When I walked in I noticed that the tail lights where still lite up real dim There where no lights on in the shed when I walked in, that is the only way I noticed it? And I had it out riding it a couple hours before! The other thing is my power steering light keeps coming on when I start it up but then when I turn it off and back on it goes off? I had it in the dealer a couple of weeks before and they replaced the voltage regulator!