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There is no real +/- on speaker wires, they pass AC current. It's really more of signal and return wire.
1999 Ford F Series Stereo Wiring
Constant 12V+ Light Green/Pink
Switched 12V+ Black/Purple
Ground Black
Illumination Light Blue/Red
Amplifier Remote Blue
Left Front (+) Light Blue/White
Left Front (-) Orange/Light Green
Right Front (+) Dark Green
Right Front (-) White/Light Green
Left Rear (+) Tan/Yellow
Left Rear (-) Gray/Light Blue
Right Rear (+) Brown/Pink
Right Rear (-) Orange/Red