For a 1991 Ford Ranger, the wiring diagram for the stereo typically includes the following color codes: the constant power wire is usually yellow, the ignition power wire is red, the ground wire is black, the left speaker wires are white (positive) and white/black (negative), and the right speaker wires are gray (positive) and gray/black (negative). It's important to refer to a wiring diagram specific to your vehicle's model and stereo type for accurate connections. Always double-check with a multimeter to ensure proper wiring before installation.
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