The yellow one is or goes on like a factory amp like a bose speaker amp set up like in the maxima cars got i will not worry about it cut it off pos to pos neg to neg your good speakers play your happy you here it thats that later >>>>>>>>> dude!
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One wire should be a solid color and is the + wire to the speaker connection, the other wire should be a two colored wire, but will have a small color stripe running along the length, this is the - side connection.
This is the most common problem with self installs.The best thing to do is to get the car radio installation plug,it will plug into the factory plug for your factory radio and will give you a color coded pigtail to wire into that usually matches up perfectly with new aftermarket car radios.If the wires are already cut then you best bet is to extend the wires so that they are easy to work with hookup the power,ground,antenna and try dirrerent combos to isolate each speaker and label the wires accordingly.
On 2003 Ford F250 trucks we have worked on, the below wire color scheme is used. Of course it would be to your advantage to perform a voltage check on the wires on OFF and ACC condition of the ignition switch. Further, continuity of the speaker through the speaker wires would also help.
there should only be the main fuse for radio. but heres the the color codes
3 1/2" Dash
Left Front (+)
Left Front (-)
Right Front (+)
Right Front (-)
6" x 9" Rear Deck
Left Rear (+)
Left Rear (-)
Right Rear (+)
Right Rear (-)
Green/Orange hope that helps if u need more help feel free to email me at firstname.lastname@example.org
best way is to get in the with a multireader and find a constant power and a ignition, for the speakers, i use a AA battery with a wire on each end, to test the spekers, you will hear a pop from speaker, so you can find which wires go to what speaker.
Here are the colors for the radio harness on your '91 Escort.
1991 Ford Escort Radio Color Codes
Battery Constant 12v+ Wire: Blue/Red Accessory Switched 12v+ Wire: Blue/Black Ground Wire: Black Illumination Wire: Red/Black Left Front Speaker (+): Violet Left Front Speaker (-): Blue/Orange Right Front Speaker(+): Blue/White Right Front Speaker(-): White Left Rear Speaker (+): White/Blue Left Rear Speaker (-): Red/Blue Right Rear Speaker (+): White/Green Right Rear Speaker (-): Blue
here is wire color diagram. 1994 Ford Explorer Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Light Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Red or Black Car Radio Illumination Wire: Orange/Black Car Stereo Dimmer Wire: Light Blue/Red Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: Blue Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Orange/Light Green Left Front Speaker Negative Wire (-): Light Blue/White Right Front Speaker Positive Wire (+): White/Light Green Right Front Speaker Negative Wire (-): Pink/Light Green Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Pink/Light Green Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red