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That's hard to answer cause it depends on how far back on the wire harness they cut. Plus if you have a Bose system or not. I would highly suggest to take it into a stereo install shop to at least check it out but maybe install the new stereo.
There is a wiring color code that all vehicles use but if the wires have been cut to far back they will be different colors. If you have a factory amp then you will have to rewire for the speakers to bypass it.
I added below the color code. Make sure you disconnect your battery before you start wiring anything.
Please note: You can do major damage to your truck computer and other components if you wire it wrong.
I just replaced the factory stereo in my vehicle yesterday, and found at the local parts store a mounting kit, and a wire harness kit, which made it a 45 minute install, and it looks professional. I spent less than $30 dollars on both pieces, and everything was explained in detail, and no wires were cut, keeping the factory harness intact!
2003 Nissan Frontier Truck Car Radio Stereo Audio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Pink Car Radio Accessory Switched 12v+ Wire: Blue Car Radio Ground Wire: Gray or Chassis Car Radio Illumination Wire: Red/Blue Car Stereo Dimmer Wire: Red/Yellow Car Stereo Antenna Trigger: N/A 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 (+): Pink Left Front Speaker Negative Wire (-): Blue Right Front Speaker Positive Wire (+): White Right Front Speaker Negative Wire (-): Black 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 (-): Violet Right Rear Speaker Positive Wire (+): Blue Right Rear Speaker Negative Wire (-): Pink
The Wht/Blue wire is allways 12 volts; The Ylw/Red is switched only when the car key is on accessories.
1994 Isuzu Amigo Car Radio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: White/Blue Car Radio Accessory Switched 12v+ Wire: Yellow/Red Car Radio Ground Wire: Black Car Radio Illumination Wire: Blue/White Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 5 1/4′ Car Audio Front Speakers Location: Dash Left Front Speaker Positive Wire (+): Blue/Green Left Front Speaker Negative Wire (-): Gray/Black Right Front Speaker Positive Wire (+): Red/Green Right Front Speaker Negative Wire (-): Brown/Black Car Audio Rear Speakers Size: 5 1/4′ Car Audio Rear Speakers Location: Side Panels Left Rear Speaker Positive Wire (+): Blue/Yellow Left Rear Speaker Negative Wire (-): Gray/White Right Rear Speaker Positive Wire (+): Red/Yellow Right Rear Speaker Negative Wire (-): Brown/White
Stereo dealers have wire harness adapters for almost every make and model of car. It will come with a connector both with color coded pigtails that are usually prestripped. The package will described which wires go where and their color codes. The deck you bought should have a pigtail with color coded wires and they'll match up to the ones on the harness adapter for your car. After connecting them all properly, you can take your deck with the attached pigtail and plug adapter and plug it directly into your car stereo plug where your old radio was connected...don't forget the anntenna lead as well... Not to difficult...email if you get stuck... KEN
If you have the time you will have to trace the wires. Using a 12vdc test light, ground one lead to chasis ground. Use other lead to test each wire to see which one has 12volts and mark it with masking tape or write down the color wire. Put it aside and turn on the ignition and find that 12volt and write ignition to that color wire. Now hat you have idenitifed the 12vdc hot and the 12volt ignition. Take a nine volt battery and put one of the remaining wires to one post on the battery, hold it on and go thru the wires until you hear which speaker pops font left or front right,etc. Just scratch the battery post DO NOT HOLD ON. This will identify which speakers are where. Be sure that you identify pairs that cause the pop for what speaker and you should be good to go. If you have any more questions please ask.
White/Yellow Stripe or White/Blue Stripe
Left Front Speaker (+)
Left Front Speaker (-)
Right Front Speaker (+)
Right Front Speaker (-)
Left Rear Speaker (+)
Left Rear Speaker (-)
Right Rear Speaker (+)
Right Rear Speaker (-)