What exactly is a wire tuck?

I cant find the ground wire on my stock radio HELP 10points?

• I bought a 95 eclipse with no radio. So I went and bought a stock 95 eclipse radio for $40. I found the ground wire from the car but I cant find the ground wire from the radio. Theres no wire thats all black and the colors if the harness dont match. Is there another way to find out where the ground wire from my radio is located. Im so confused. Will give 10pints for best answer thanks in advance. Car Radio Battery Constant 12v+ Wire: Red/Black Car Radio Accessory Switched 12v+ Wire: Blue Car Radio Ground Wire: Chassis Car Radio Illumination Wire: Green/White Car Stereo Dimmer Wire: Black/Yellow Car Stereo Antenna Trigger Wire: White/Black 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: Doors Left Front Speaker Positive Wire (+): Black/White Left Front Speaker Negative Wire (-): Black Right Front Speaker Positive Wire (+): Black/White Right Front Speaker Negative Wire (-): Black Car Audio Rear Speakers Size: 6″ x 9″ Car Audio Rear Speakers Location: Side Panels Left Rear Speaker Positive Wire (+): Yellow/Blue Left Rear Speaker Negative Wire (-): Gray/Blue Right Rear Speaker Positive Wire (+): Yellow/Red Right Rear Speaker Negative Wire (-): Gray/Red

• Answer:

  some radios doesnt have a ground wire. the ground wire from the car screws onto the body of the radio. is there a screw or a nut/bolt that looks like you can put a loop connector thing onto?