If this is an aftermarket stereo, The red wire needs to go to a power source that turns on and off when you turn your key on and off ( a fuse in the fuse box ). The yellow wire needs to have power all the time like its connected to the positive battery terminal or a fuse in the fuse box that always has power and the black wire is the ground and needs to be grounded to the negative battery terminal.
SOURCE: instaling alpine car/cd stereo cda 9807
how do i install my alpine cda 9884 ...on a 92 caddi
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