Hi, according to my source, there should be an accessory wire that is blue with a yellow stripe. If your is yellow/red, that's fine. You actually should prefer an accessory wire to an ignition wire as there may be less static on the accessory wire. Just make sure the wire does not have power when the key is off. Don't use the illumination wires--they are not needed for the aftermarket head unit and should be taped off.
1991 Subaru Legacy Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Red/Green
Car Radio Switched 12v+ Wire: Blue/Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size:
6 1/2? Speakers
Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Yellow
Left Front Speaker Negative Wire (-): Blue/Red
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Blue/Black
Rear Speakers Size:
6 1/2? Speakers
Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Yellow/White
Left Rear Speaker Negative Wire (-): Blue/Red
Right Rear Speaker Positive Wire (+): White/Blue
Right Rear Speaker Negative Wire (-): Blue/Black
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