My Eclipse HU has been acting up. Every once and a while it would reset itself to defualt settings.

I thought that it was a bad ground or connection, and after a little searching I found somethings that may have caused it to trip out. It was fine for about a week.

Today when I got gas, I left the lights and stereo on and when I went to start my car the stereo reset itself again. At this point I'm thinking that maybe the headlights and the stereo running for 5 min. may have drained the battery enough to reset the stereo upon start up?

Is the battery dying?

I did the same thing when i got home, with the same result. The stereo works fine, and only resets after I restart the car (After leaving the lights and stereo on).

 

Check your 12V source wire to your headunit and see if there is any power.
It seems you blew a fuse.

 

If the fuse blew wouldn't it not work at all?