The speakers seem skittish, but it's not the speakers, as they work on other stereos. Sometimes one speaker works, then they both work for a little bit, then neither work. The speakers and speaker wire are OK. Should I start digging in the stereo, and if so, what should I replace and/or look for? Thanks.
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If you have a non-original stereo, there may be inline fuses in the wire harness leading to the stereo. Look under the dash with a flashlight and see if you can find the harness. Alternatively, you can pull the stereo from the dash and look at the wires that way.
The speakers can be checked by using a 1.5 volt battery. Unhook the speaker wires from the back of the stereo. Then, using jumper wires, MOMENTARILY connect the battery to each pair of speaker wires. If the speaker is good, you will hear the speaker cone move (it will make kind of a scratching noise) as the battery is connected.
If the speakers check out, and you are SURE that the stereo is receiving power and ground at all the correct points, then I'm afraid that your stereo is likely damaged.
Some stereo system have the ability to switch off the speakers when playing via headphones. In others the headphone socket itself does the switching. However headphone sockets can become faulty and when the headphone plug is removed it doesn't restore sound to the speakers. It's very easy to fix this, with a check that the contacts are not bent out of place. Or you can rewire a new headphone socket, making a note of the wire connections before you replace it.
Sometimes it is quite difficult to get the speaker cable to make a good contact with the speaker sockets. You should check that they are making contact.
To test any loudspeaker just connect a 1.5 battery for a short time across the disconnected speaker. If working the speaker will pop!
As the sound is going to the headphones the amp seems to be OK and one of the above options should correct the problem.
Let's distill this down to its simplest configuration... does the onboard FM produce sound? If not, nothing will.
NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.
Turn the volume control to something medium.
The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.
Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.
There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
Turn the volume to something reasonable and see if that helped.
Yes you can use either A or B without a problem. The restriction is when you have both A & B connected. In that case, the speakers MUST be a minimum of 8 Ohm impedence. Using either A or B, you can use speakers of 4 Ohms impedence.
Car Radio Battery Constant 12v+ Wire: Gray/Red
Car Radio Accessory Switched 12v+ Wire: Black/Pink
Car Radio Ground Wire: Strap or Chassis
Car Radio Illumination Wire: Orange/Tan
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Gray/Green
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Green/Brown
Right Front Speaker Positive Wire (+): Gray
Right Front Speaker Negative Wire (-): Gray/Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Green/Black
Left Rear Speaker Negative Wire (-): Green/Orange
Right Rear Speaker Positive Wire (+): Gray/Black
Right Rear Speaker Negative Wire (-): Gray/Pink
It sounds to me like there is a dirty connection or a failing component in your stereo. Being intermittent like you've described, is hard problem to figure out. It could be just the connection you are getting at the speaker terminal. But, If you aren't shy about opening up your stereo to see the guts, try getting some denaturated alcohol and clean the connectors inside. Then if you are familiar with soldering you could check the connections in the driver circuts and see if you can re-flow some of the connections. I had that problem with my receiver. The video output was be flaky so I flowed some new solder on some terminals and it works perfectly. I hope things work out. -Andrew Hawkins