The smartest thing is spend the money and purchase vechial adapter pigtail made specially for your brand of head unit and presided connector for a easy plug and play, from crutchfield.com. No guess work no schematics or wiring diagrams to follow plug in connector to vehicle harness and back of your aftermarket stereo put the couple plastic pieces of trim and your done. The support side of crutchfield.com is a very good resource. But if you don\'t want to spend the cash for pigtail, you can create account on auto zone.com and go to vehical repair guides and click locations. Why electrical schematics are in the tab labeled, locations, is beyond me. Print it and it will give you the speaker color codes and wire functions with connect pin location numbers. Just remember the industry standard, except for couple exotics, is that first color listed is the main color separated by a /, forward slash, and followed by the color of the strips. And japain cars occasionally use a stopped lines. Same color codes as if solid stripe. Auto zone also has the manufactures service procedure of how to properly remove old stereo unit with out damage. If your car is too new for auto zone listing then I suggest pay $20 to alldatadiy.com as a mechanic the shop pays $1500 a year subscription for alldatapro.com which has all the manufacture procedures, tsb\'s, schematis, and locations, but for twenty a year per vehicle you have access to all the same information as the mechanic in all non dealership associated shops.
When doing wiring always use soldering iron, pencil snapped, not a wiring gun. Gun gets too hot unless your building battery cables. Walmart got one for something like eleven bucks. And use double walled heatshring for 16-22gauge wire. Double wall has heat activated glue that makes water tight seal.any corrosion from water corrosion will be noticed as distortion or noise in stereo system. Are you installing amplifiers or subwoofers? For the pound chest felt thump? Are you using factory speakers? What wattage are speakers? And measure resistance with digital multimeter or use speaker impedence Value. Head units only produce up to a 4 volt constant variable frequency and current to transmit signal. The 50watts x 4 channel is not 50watts per speaker its true my 50 watts peak and 1/2of peak watts of RMS WATTS AT 25. AND DEVIDED BY FOUR SPEAKERS IS TRUELY SOMETHING LIKE 6.5WATTS OR SO. NO IM NOT GRABBING CALCULATOR, 6*4=24 SO A FUZZ OVER. I HAVE FOUR SIX BY NINES RUNNING OFF A 4 CHANNEL 600 WATT RMS 1200 WATT PEAK DUAL MONOBLOCK AMP RUNNING AT 4 OHMS PER SPEAKER WIRED IN PARALLELD EQUALS 2 OHMS OHMS PER BLOCK AND TOTAL OF 4 OHM TOTAL CIRCT LOAD OHM WITH ALL FOUR SPEAKERS USING BOTH BLOCKS. THE 600 WATTS IS RMS OR HALF OF PEAK AND WHILE USING DUAL MOMOBLOCK MEANS ONLY 300 WATTS PER EVERY 2 CHANNELS AT 2 OHMS. BUT IM WIRED AT FOUR OHMS AND OHMS LAW SAYS TO DOUBLE IMPEADANCE OR MEASURED CIRCUT RESISTANCE YOU NEED TO DEVIDE WATTS. SO 150 WATTS PER BLOCK. AND DEVIDE FOR TWO SPEAKERS AND GET 75 WATTS. SPEAKERS ARE RATED AT 90 WATTS, THANKS TO NEWEST 6X8 INCH, YA 8, 4WAY FULL RANGE SPEAKER. 4 WAY MEANS HAS FOUR SPEAKERS BUILT INTO ONE TO PRODUCE FOUR DIFFERECT FREQUENCY RANGES. STAY AWAY FROM COMPONET TYPE SPEAKERS AS YOU,LL HAVE TO MATCH IMPEDENCES, AND WIRE THE THREE OR FOUR SPEAKERS TOGETHER TO MAKE THE ONE FULL RANGE SPEAKER WITH CAPACITORS. AND ... ON AND ON. SO IF USING OEM OR ORIGIONAL MANUFACTIOR EQUIPTMENT, SPEAKERS YOU SHOULD NEED TO KNOW IF THEY ARE COMPONET OR FULL RANGE. AND NEWER CARS HAVE THE AMPLIFIER AND ALL THIS MATH MATCHED TO PROPER RATED SPEAKERS. AAN WELL AS A CFEW YEAR OLD VEHICAL MAY HAVE A 1200 DOLLOR KENWOOD IN IT WITH BUILT IN AMPLIFIERS THAT AFTERMARKET SYSTEMS DO NOT HAVE. BUT NO TAG SAYS THAT. IT\'LL SAY DELPHI FOR CHEVY MOPAR FOR CRYSTLER , MOTORCRAFT FOR FORD, AND SO ON. SO. HOW FAR DEEP DO YOU WANT TO DIVE? THE MONEY SPENT ON CONNECTOR ADPTING HARNESS FROM CRUTCHFIELD MAY HAVE JUST PAID FOR ITS SELF. IN STRESS AND ****** OFF TIME SPENT. AND THEY HAVE GOOD PRICES ON HEAD UNITS, SPEAKERS, DASH ADAPTER KIT, FOR PLASTIC SIZE AND MOUNTS FOR THE DIFFERENT SHAPED UNIT, AND GIVES A DISCOUNT IF YOU BUY THE UNIT AND ADAPTER HARNESS TOGETHER. WITH FREE SHIPPING A LOT OF THE TIME WITH AMAZING SUPPORT PAGE, CRUTCHFIELD IS THE PLACE TO GO FOR MOBILE AUDIO. Crutchfield Car Stereo Speakers Home Theater LED LCD TV Cameras AutoZone Auto Parts Accessories Repair Guides More ALLDATAdiy com Leading Source of Factory Automotive Repair Information