weird wire problem with rear defroster

hello everyone.

I have an interesting problem with my car, and was wondering if this ever happened to anyone else...

Everything is normal, until I turn on the rear defroster switch.  Its light goes on, and every still good.  Then, when the timer for the defoster kicks in, its light goes off, and the front right speaker goes haywire, whether radio is on or off.  I press the defroster switch, and the noise stops.  I turn the defroster on and again, and now the noise kicks in immediately.  Shut ignition off, and now i get the time-delayed thing again... i have a basic MP3/CD jensen head unit, and just used some wiring caps for the connections, factory speakers.

any help appreciated...Chris

Did you use a wire harnest or did you cut the factory plug.. There might be something crossed somewhere.. If you wanted too you could just rewire since its only the front speaker..