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Use a multimeter in Ohms mode to place a tickle of electricity to each speaker wire. you should hear each speaker crackle. (Multimeters only use a 9v battery internally)
Label each pair of wires for speakers.
Their color coding may help. Keep the negative & positive wires to the speakers correct so that the speakers all travel in a forward motion together or you will have distortion from one speaker that is out of phase with the others.
You will also have a permanent +12v line and a Ignition Key +12 volt line.
One keeps the station memory etc when the ignition key is off.
What kind of vehicle? and yes you can ive done this on a few german cars. If your not up to snooping the web for factory diagrams I recommend going to the speakers directly which may require popping door panels off etc... for multiple reasons 1 to label the wire colors to match them at the amp so I can draw a diagram on a piece of paper 2 check the condition of the speaker for tears wear etc....3 to mark any labeling on the back of the speaker especially the impedance values this is super important in wiring on a aftermarket 2 channel amp heres a link to help : http://www.ehow.com/how_6312803_wire-four-speakers-2_channel-amp.html . Once youve jotted down all speaker wiring colors and connected to the amp I would recommend running your own 12v power from the battery and ignition power and ground wires make sure to cap off factory power wires... good luck
if it is a 5.1 channel amp wire the center speakers together into the same port. wire the two front speakers in the or der that they would appear on the amp (such as left front speaker to the left front speaker terminal on the amp etc.) and do the same for the rear speakers. and all you should have left is the sub-woofer channel in which you do not have to worry about.
Nice amp.....the lights are turning on? Did you double checek that all speakers and connections are properly hoooked up. If you are getting power and have a proper ground, there should be no issues. Ensure all other wires are hooked up (to and from your deck, speakers etc.)
Here are the factory wiring colors match these to the aftermarket names (12v to 12v Ign - Ign, etc)
1993 Ford Probe Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Blue/White
Car Radio Ground Wire: Black/Pink
Car Radio Illumination Wire: Orange
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Light Green/Yellow
Car Stereo Amp Trigger Wire: N/A
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 (+): Blue/Green
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): Blue/Black
Right Front Speaker Negative Wire (-): Blue/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Light Green
Left Rear Speaker Negative Wire (-): Green/Orange
Right Rear Speaker Positive Wire (+): Green/Yellow
Right Rear Speaker Negative Wire (-): Green/Blue
Start by connecting it to one of the other outputs off the deck, say the left rear. If it still doesn't work, remove the speaker and connect it directly to the head unit. If it works, then it's the speaker wire, if it doesn't, it's the speaker. If there are amplifiers installed, switch RCA cables left for right etc. and see if the problem moves with the cable switch, try the same with the speaker connections at the amp. This will narrow down whether it's the amp or the RCA cable etc. Car audio problems can be handled by a process of elimination! Eliminate what it's not and you're pointed directly to what it is.
If your amplifier has what they call High level inputs (basically inputs on the amp that you run the speaker wires from your radio into), you can splice wires from where the connectors are on your rear speaker(s), still leaving the speaker hooked up, and use those as an input into the amp. If your amplifier does not have high level inputs, a convertor is available to turn an audio signal from your radio output speaker wires ( spliced in just as above, leaving the speaker hooked up), into an rca output jack. Or the best thing to do would be to buy another say 2-4 channel amp w/high level inputs and rca inputs and outputs, and run your rear speaker wires into the amp. Then you'll be able to run the rca cables out of that amp and into the sub amp, and you'll have the new amp to power your rear speakers or rears and fronts. That would be ideal. But, A convertor is your best bet. Got em at best buy, circuit city, etc. Hope this was helpful.
The right speaker will connect to the R+ and R- terminals and the left speaker will connect to the L+ and L- terminals. Only one speaker per connection. If both speakers are not exactly the same brand, part number,size, etc. then they may NOT sound the same. Be sure to watch the polarity of the speakers so they don't interfere with each other. I.E. speaker + to amp + etc. Good luck.