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Doubtful, trace wires from speakers using test light, does new amp have coaxial connectors? you may have incompatible model, probably need to match amp with new head unit, worst case you can rewire speakers directly to amp, use new wires, leave old wires in place just cut ends and put tape over.
If you do not have access to an aftermarket interface cable (some are available depending on brand and model of aftermarket radio), then yes, you have to bypass the amp if the new head unit has an internal amp, AND you wish to use the factory speakers with the new stereo.
There are many ways to do this, but if you want to do it yourself, the absolute best way is to get a copy of the dash harness wiring diagram from GM. This diagram will identify which pins in the radio dash harness connector run to the speakers and/or the amp, and whether you have to run new wires to the output side of the amp to connect to the speakers--this will not be specifically identified in the GM diagram (it will not say anything like 'to connect aftermarket radio, etc.), but it will be evident that you have to do this if there are no speaker pins in the in-dash connector.
The Infinity system includes a CD/cassette receiver or a CD receiver in the dash, and a complement of 7 speakers: 3-1/2" speakers in the dash (left, right), a 2-1/2" center dash speaker, two 6"x9" woofers in the front doors, and two 5-1/4" speakers in the rear doors. You'll have to remove a section of the dash to install a new stereo, as you do with the non-Infinity system. You'll need a special adapter to connect a new car stereo to the Infinity factory amp http://www.crutchfield.com/p_120CHTO02/Axxess-CHTO-02-Factory-Integration-Adapter.html?tp=3486
There could be several reasons why the head unit for your car does not work. The most likely issue is that the head unit is not compatible with your stereo system. You can consult your vehicle owner's manual for speaker issues.--------------------------------------------------------------------------------------- Diagnostic VAG
there is an amp usually built into the factory head unit or mounted in the dash behind the head unit. I would try running a new wire straight from the back of the stereo to the speaker and see if it works. if it does then you have a broken wire and need to run new ones
sounds the like the vehicle had an oem amplifier that was removed, most after market stereo installers will trace the speakers wires individually by continuity to by pass the factory amplifier and wire the new head unit to the vehicles speakers, if the harness has been spliced or factory amp removed, you will need to check if the amplifier still exists (usually under passenger rear seat sometimes located in trunk area) and see if the harness has been bypassed. if so you will have to reconnect the harness by color code in order to use the factory head unit
U have a Factory audio auxiliary amp in the truck, the radio is just a head unit with a preamp feeding a main amp, that is behind the right rear 1/4 panel trim panel in the cargo area, if your new sound unit has preamp outputs use them, other wise u must wire around the Ford factory amplifier.
You don't want to fit that - it's the factory amplifier for the rear speakers (the rears are amped, the fronts are not). You need to run new wires from the head unit back to the new rear speakers so that the speaker-level outputs from the new head unit are used to drive the new speakers.
You can't use any of those - the large connector at the OEM speakers is because the rears are amplified. Your factory head unit puts out a line level signal to the rear speakers. There's an amplifier on the driver's side rear speaker (the box around the magnet that you can see from inside the trunk).
You need to either replace the head unit with an aftermarket one to drive your new speakers, or you need to tap into the amp connector and find the line level wires, break them out, put RCA plugs onto them, and plug them into an aftermarket amp, which you'd use to power your rear speakers. Doing it that way allows you to keep the factory head unit.