Question about 1998 Ford Expedition

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Why is rear stock subwoofer not working?

I have a 1998 Ford Expedition Eddie Bauer 5.4L with stock Mach Audio sound system. After installing aftermarket stereo the rear subwoofer doesn't work. Wondering if I didn't hook up a wire or blew a fuse.

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Check if the REMOTE wire to the sub amp has the 12-volt trigger voltage at turn ON. Firstly, be sure your wiring is in order.
Hope this helps...

Posted on May 12, 2014

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The easy thing is check your fuses, and then go over the wiring diagram enclosed with the unit. Most aftermarket units have a separate output for subwoofers, either RCA type, or Din.

Posted on May 11, 2014

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I need to have more info about how you installed it, did you use rca wires from the radio to the amp.? Make sure the sub setting on radio is turned on. Make sure rca wire are in the input connection and not output, also check you connection from radio that they're in rite place. I really need more info about the map of your wireing

Posted on May 10, 2014

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SOURCE: I have a 2001 Ford Expedition Eddie Bauer rear AMP doesnt work?

there should be fuses near your amp and near the battery

Posted on Jan 07, 2009

  • 31 Answers

SOURCE: My stereo,Mach brand, on my 98 Ford Expedition

Is this a factory radio? First check alll of the fuses, fuse links inside and under the hood. There could be a couple of possible issues. When you hook up the cables wrong you ultimately send power to the ground circuits and ground to the power circuits. There are lots of modules in most vehicles and they are succepable to voltage spikes. There is a common industry term called "letting the magic smoke out" when this happens. If your vehicle has a body control module, it could have been damaged, the radio itself could also be a module and have been damaged. There could also be an amplifier that may have shorted out, this would explain the radio powering up but no sound. If you can get a wiring schematic and pull the radio you can check the inputs (power,gnd ,etc). If you had done this on a Nissan we would'nt be having this conversation, Nissan installs a safety relay on their vehicles that is wired in backwards and is only energized if the cables are reversed, this relay disconnects all of the sensative equipment/modules so they are'nt harmed once it is energized. I would'nt go out and buy one just for this feature, just food for thought.

Posted on Aug 20, 2009

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