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Since you posted this in cars and trucks I assume this is a bose car system. Most bose auto systems have the amp physically attached to the individual speakers. This means each speaker needs the following wires +12v, 12v ground, + signal and - signal. It also means that the head unit cannot directly drive a non bose speaker. If you are replacing the speakers and bose radio the best thing to do is to run new speaker wires. You can reuse the factory ones if you can identify which ones are what...and that may be a pain. If the bose amps are ok and you want to replace the speaker you would need to leave them connected and wire the new speaker to the wires on the bose speaker that come from the bose amp. Depending on the specific bose system there may be an actual wire that runs to the speaker from the amp but on others the amp is directly connected to the voice coil leads of the bose speaker.
either your connectors need cleaning or maybe a break in the wiring. Is there on spot where both wires come together if so check there.If there is any plugs, pull them apart and clean them with contact cleaner
Here is a list of radio wiring harness wire color codes and what they do. I have given both with and W/O Bose.
Nissan Maxima Car Stereo Radio Wiring DiagramRadio Constant 12V+ Wire: Pink/Blue
Radio Ignition Switched 12V+ Wire: Blue/Black
Radio Ground Wire: Vehicle Chassis
Radio Illumination Wire: Red/Blue
Radio Dimmer Wire: Red/Orange
Radio Antenna Trigger Wire: Black/Red
Front Speakers Location: Doors
Left Front Speaker Wire (+): Blue/White
Left Front Speaker Wire (-): Blue/Yellow
Right Front Speaker Wire (+): Brown
Right Front Speaker Wire (-): Brown/White
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Red
Left Rear Speaker Wire (-): Green
Right Rear Speaker Wire (+): Blue
Right Rear Speaker Wire (-): Pink
1997 Nissan Maxima with Bose Stereo Wiring Diagram W/Bose Car Radio Battery Constant 12v+ Wire: Pink/Blue
Car Radio Accessory Switched 12v+ Wire: Blue
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red/Blue
Car Stereo Dimmer Wire: Red/Yellow
Car Stereo Antenna Trigger Wire: Black/Red
Car Stereo Amp Trigger Wire: Green/White
Car Stereo Amplifier Location: Each speaker has its own amplifier located at each speaker.
Left Front Speaker Positive Wire (+): Yellow
Left Front Speaker Negative Wire (-): Brown
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Light Green
Left Rear Speaker Positive Wire (+): Red
Left Rear Speaker Negative Wire (-): Green
Right Rear Speaker Positive Wire (+): Pink
Right Rear Speaker Negative Wire (-): Blue
black = ground dark green = lights on input grey = panel lights pink = on input yellow = power input orange = battery power input
nca = shield ground tan = left fr spkr + orange/black = left & right spkr -neg lite green = right fr spkr +
nca = shield ground dark blue = right rear spkr + dark green/yellow = right & left spkr - neg brown = left rear spkr +
purple/white = display dim output pink = vehicle speed input ----------------------------------------------------------------------- **** 91 park ave without delco bose =
purple/white = display dim output pink = vehicle speed input
grey = left front - neg tan = left front + pos dark green = right front - neg light green = right front + pos
black = ground dark green = display dim signal grey = panel lights pink = power antanna yellow = ign input orange = battery power light blue = right rear - neg dark blue = right rear + pos yellow = left rear - neg brown = left rear + pos .