Trailblazer 2006 radio speakers sometimes sound and other times do not; is it the amp?

Is this a factory radio

hi

sounds like a electrical problem

i would take it in for a free quote to identify the problem

there is definitely a loose connection or loom


cheers

Not hooked up properly..maybe just loose wires

Assuming this applies to all the speakers in the TrailBlazer, you likely have an amplifier transistor in the radio going bad. When they occasionally work, or you get a "crackling" sound it is usually the amp. A slim possibility is a bad ground, but that usually won't affect all speakers, only one.

The most common solution is both rear speakers are bad. Not what you expect, but is what we usually find. could be a driver in the radio.
Go back to the rear speaker and put your ear right on the speaker and notice if there is a faint sound.
Have a test speaker and plug up before you buy the correct ones.

Turn radio on and unplug speakers one at a time until you hear sound one of your speakers is blown and when it shorts it does something to the sound and cuts totally out..once u find the bad speaker and un plug or replace it will work

Here are the factory wire colors.
2004 Chevrolet Trailblazer Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

First Visually check all your fuses. Does rig have amp for stereo by any chance? It sounds like amp is bad and/or fuse is blown. Amp is wired between radio and speakers, and a shorted amp would make crackling in speakers when radio is OFF

RADIO 12V|orange |+ |radio |
| RADIO GROUND|black/white |- |radio |
| RADIO SWITCH| | | |
| RADIO ILLUMINATE|brown/white (dimmer)|+ |radio |
| POWER ANTENNA|gray |+ |radio |
| LF SPEAKER|tan - gray | |radio |
| RF SPEAKER|lt. green - green | |radio |
| LR SPEAKER|brown - yellow | |radio |
| RR SPEAKER|blue - lt. blue | |radio | Notes:

Van necesitar correr un cable para acessorio

I disconnected the amp and ran jumper wires for the proper speakers (two wires per speaker eight total) . Basically I bypassed the amp now all speakers work and sound fine.