Left front channel has stopped working

You 'looked' at the wiring but have proven it is defective by swapping the speaker independent of the wiring. What's next? Replace the bad wiring.

What happens when you put a working speaker and wire on the front left output?

If you have checked the speakers and wiring, the right channel has a audio driver or output problem, which explains the low volume, static, and distortion. A service technician will be required to fix the receiver so it will balance the left side.

check if left speaker is shut off /connections one speaker my be on a side the other on b side check all speaker connections

if front left is working it is possible u have a dry solder on ur right channel line. try resoldering or if u want to know exactly where dry solder is, shake gently every right channel components and connections. if resoldering does not work it is possible u have a faulty ouput amp for ur right channel. if ur not sure about this i suggest u get it checked by a qualified tech.

Sounds like you have the ground and live possibly the other way around from the head unit to the speakers. The reason for you hearing it from both the tweeter and the speaker is that the tweeter is connected in parallel to the speaker.
Swap the wiring and try it.

Have you tried another speaker? If your left front speaker is in the door as in most cars, it gets banged around a lot. The driver's door gets the most use. This sometimes results in mechanical problems with the speaker, and can cause low sound or distortion. Take the speaker cover off (it may be necessary to remove the door panel in a factory installation), disconnect the speaker and hook another in its place. If the volume is back to normal you know it's the speaker. If not, check the radio and speaker wiring. If the radio itself is at fault because the amplifier is bad, it can be repaired at a service shop. The repair charges might be close to replacement cost these days, so you might consider a new radio if the estimate is high.

HI DUDE TRY TO CONNECT ONLY 2 PC OF UR 6x9 AT FRONT CHANNEL TRY IT OUT COZ IT MAYBE THE DONT HAVE MUCH POWER TO HIT VOLUME OR ELSE TAKE OUT UR SUB CONNECT TO FRONT CHANNEL OR CHECK UR SUB VOLUME .,...

Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
Front Speakers 5 1/4" Doors Left Front (+) Green Left Front (-) Black/White Right Front (+) White/Red Right Front (-) Black/White Rear Speakers 6" x 9" Rear Deck Left Rear (+) Pink/Red Left Rear (-) Pink/Blue Right Rear (+) Pink/Light Blue Right Rear (-) Green/Red

The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.

Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?

Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.

As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.

The radios claim 50W per channel, but in reality give 12-15W RMS power.

A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.

This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.

Good Luck!!

Audio output electrlytic capacitors have dried out, locate & replace them if you want your sound back, it's cheap but not easy.

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.