THE PROBLEM is that being in atruck the vibration are greater and things move in time and as this has hapend its quite possible its shorted on the speakers and blow the audio chip so if that is the case just buy an amp and conect that and fix the problem a lot cheaper
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Possible scenerio's with the little info you gave.
1.You have a bad speaker thats blown or the wires are touching the chassis of your car.
2. You have a factory amp and you need to connect the blue wire to the amp turn on wire. And if it still doesnt work then you have to rewire it complete or maybe have to get a special car amplifier compatible harness so your aftermarket works with your amplified system in your car.
3. In certain Ford cars they crisscrossed the back speaker wires. To test this unplug your harness from the radio. VERY IMPORTANT( splice these colors of wires in the middle enough so you can use a 9volt small rectangular battery to make the speakers you want to test pop(harmless)) 1. green = back left + speaker 2. green/black = back left - speaker 3. purple = back right + speaker 4. purple/black = back right - speaker
test green speaker wires first touch battery to the + and - and the speaker should pop if not you have already discovered the problem. Know this time pop the green + and the purple/black - on the 9volt battery if the speakers pop you have found the solution.
Just criss cross the the negatives of the back speakers. From the radio harness end attach green to green, purple to purple, green/black to purple/black and last purple/black to green/black. And all your speakers should work again.
Dont ask me why late Ford Models crisscrossed their speaker wires. They just did.
I just had this problem with my e34 bimmer, just connect the blue wire to with the red wire (apparently the 9887 shuts off the antenna when the radio is off). so in my case, bmw thought it was a good idea to wire the two together, which means you go to CD and the Deck shuts off the amp, killing the speakers.
you have wires grounding out at the back of the unit. i suggest trying to completely rewire it and see how that works. its easy if youve never done an install so dont sweat it. email me if you have any questions.
Hi!, use a multimeter to test (With the car key in "ACC" position) from what cable your old stereo was receiving power, when you found the correct cables, mark them. Then test what cables carries the audio signal to the speakers, you can do this by using a AA battery and connecting it to the cables for a short time, the speaker would make noise, label the cables as R or L. The connections in the PIONEER's plug are: RED: Accesory (This is powered when the key is in ACC position only) YELLOW: Back-up (This is ALWAYS powered from the battery to keep the clock and other settings) White / striped white: Speaker (FRONT R or L) Gray / Striped gray: Speaker (FRONT R or L) Purple / striped purple: Speaker (REAR R or L) Green / striped green: Speaker (REAR R or L) Blue: REMOTE (Don't connect) All striped cables are the minus (-) pole of the speakers. I don't remember what color are for R or L speakers but i know what are front or rear ones, the installation manual can tell you the correct wiring or you can use a test CD, or the balance/fader controls when everything are connected.