There is no sound in the left speaker when i play LP's. When i play CD's and the radio both speakers work, but when i play records sound only comes out of the right speaker. What's up with that?

all speakers r connected to the same wires on the radio
If left/right balance and front/rear fader work properly
and sound is coming out it is likely (but not definite) radio is ok and speaker wiring is the issue.
HOWEVER, if it sounds the same on both left and right, it could be the radio. It is unlikely both sides have the same issue at the same time without it being in the radio.
The only way to verify it to disconnect the speaker and substitute a known good speaker.
So back to troubleshooting.

It seem like the stereo for the radio is failing, either because of a weak radio signal or defective aerial

some cd has only 2 channel sound. which is called stereophonic sound. when u play these cds the audio will be heard only on front left & right speakers. in order to get sound in all four speakers u need a 4.1 channel sound dvd/cd. see on the label of cd/dvd if 4.1 ch. sound is recorded on it.

DOES THE RADIO PLAY? HERE ARE THE FACTORY WIRING COLORS FOR THE RADIO HARNESS, RECHECK YOUR WORK. IF U FIND NOTHING THEN IF THE RADIO PLAYS THE CD PLAYER IS DEFECTIVE, IT HAPPENS BELIEVE ME.

2001 Chrysler 300M Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Pink
Car Radio Accessory Switched 12v+ Wire: Red/White
Car Radio Ground Wire: Chassis or Strap
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Orange
Car Stereo Antenna Trigger Wire: Orange/Red
Car Stereo Cell Phone Mute Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: Located under the rear deck in the trunk.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Dark Green
Left Front Speaker Negative Wire (-): Brown/Red
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Dark Blue/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/Yellow
Left Rear Speaker Negative Wire (-): Brown/Light Blue
Right Rear Speaker Positive Wire (+): Dark Blue/White
Right Rear Speaker Negative Wire (-): Dark Blue/Orange

theres a short in the wires either inside the box where the speakers are or the channels are blown.

after you play a cd while the cd is playing go into your audio settings and adjust theres settings foe each part on a stereo if u set the audio for AM//FM then play a cd the stereo changes to the cd settings

With the radio on u will need to push audio button it will change to something different on the face push until speaker balance comes up & then push butons below it left or right to balance each side of speakers. For me it was the left speakers that i needed to balance good luck John

I had the same problem before with the same unit, and I found that the problem was only the recording format, you have to record your MDs in SP mode, this is because, the mdx-c8200 is a non MDLP MD compatible unit. So, if you want to listen your MDs on your mdx-c8200 just don t record em in LP mode, just SP mode.

it is highly likely that you're TV is outputting mono sound, hence the left channel only. check your physical connections to the TV and the balance / channel volume on the television as well.

hi its not the system.... your recorder is set on left good luck