radio keeps popping

I have a 03 Mistubishi galant, and until recently the radio keep popping and then i get no volume. It happens on AM, FM and when listening to a CD. I have an XM unit connected via a Delphi FM modulator. I checked all the connections to the headunit. the last thing i did was run wires (for a light on the dash) behind the dash, but i have not connected it yet. Any ideas what is causing this before i go out and change the head unit? Thanks Toby

is your xm unit off when you listen to the radio?..MECP Certified

I am the loudest and proudest member of the Fighting Aggies Class of '11 WHOOP!

SAW 'EM OFF!

XM unit is off, i even disconnected the modulator, and im having the same issue.

does it have the oem infinity sound system??  if so it is possible the your factory amp is goin bad...if at first u dont succeed........ lower ur standards

No infiniti system, the standard AM/FM/CD head unit.

hmm...  i wonder if the internal amplifier in your head unit is going bad...  take the head unit to a local shop and have them bench test it for you to see if it pops with there speakers/ ant.  is it a static pop or like a power surge pop?? if at first u dont succeed........ lower ur standards

In the beginning it was a loud pop, and then silence, now i hear some static, then the pop. I was planning to disconnect the speakers one by one to see if thats the issue, but then i realized while poking around, i have to remove the rear deck. i am gonna buy a multi test tool to check the power to the head unit.

Update. Now the radio pops, and then loud static noise, lowering the volume does not work. I gave up and just purchased a Pioneer DEH-1900, it looks nice. Going to try to install it this weekend. Thanks for your help.