O.K....I need to checkWhich Unit do you have?
AM-FM Stereo AM-FM Stereo W/Cassette Tape & CD Player RDS & Auto Tone CNTRL AM-FM Stereo W/Cassette Tape Player W/RDS & Automatic Tone CTRL AM-FM Stereo W/CD Player W/ RDS & Automatic Tone Control AM-FM Stereo With Cassette Tape Player AM-FM Stereo With Compact Disc Player Monsoon
Does your Stereo have the Outboard AMP?
There are a couple of units that require a Outboard AMP.The AMP is located on the drivers side behind the rear compartment carpeting.
If the unit you are using requires the AMP, you will get very low or no sound.Otherwise, if you have verified the speakers work from the Plug at the radio & it is the amplified (internally) radio, then the radio is bad.
Also, Aftermarket can be installled using the correct Class 2 DATA Type Adapter