YOU CHECK THE CAR FUSE...BUT THE STEREO HAVE ANOTHER FUSE. CHECK IT IF PROBLEM PERSIST.... I´M SORRY BUT I THINK YOU BLOWIT ,YOU MUST GO TO REPAIRED
SOME TIMES BLOW A THIN LINES INSIDE THE STEREO AND REPAIRED THOSE WORK AGAIN AND POWER AMP IN THE STEREO BLOW TOO.
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Hi, the factory radio uses the illumination wire, but the aftermarket
radio does not. You have to make sure that wire is taped off so it
doesn't short the illumination circuit. Check your tail lights fuse.
If it's blown, pull the head unit and disconnect/tape off the
illumination wire (blue with a white stripe) from the factory harness.
Then put in a fresh fuse. If you have more questions, please specify
the model of the head unit.
1991 Ford Festiva Car Radio Wire Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Red/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Blue/White
Left Front Speaker Positive Wire (+): Blue/Red
Left Front Speaker Negative Wire (-): Blue/Yellow
Right Front Speaker Positive Wire (+): Blue
Right Front Speaker Negative Wire (-): Blue/White
Left Rear Speaker Positive Wire (+): Blue/Red
Left Rear Speaker Negative Wire (-): Blue/Green
Right Rear Speaker Positive Wire (+): Blue/White
Right Rear Speaker Negative Wire (-): Blue/Green
to check for a parasitic drain, you will need a multimeter. with battery fully charged, remove negative cable from battery. set meter to 300mA and put negative lead on the battery's negative post. put positive lead on vehicle's negative cable and check meter reading. usually, there's an initial draw for a short time (1 or 2 seconds) for the vehicle'ssecurity system, relays, etc. after that, it should only pull 30-40 mA or so, for the digital clock, radio settings, etc. if you're seeing higher numbers, try removing the main fuses (under hood fuse box) one-by-one to see where the problem is. it's also possible that a diode has gone bad in your alternator, which will draw current when the vehicle isn't running. you can check this by disconnecting the alternator's electrical connector to see if you notice a difference on the meter.
disconnect the negative battery terminal, replace the fuse with all the wires hooked up to the amp and reconnect the battery terminal, that way the initial surge of power goes through the negative terminal and not your inline fuse. That should solve your problem.
U most likely blew a fuse, replace it, if the fuse goes again check the wiring to the radio refer to this wiring chart for color difinitions of radio wiring.
1988 Ford F150 Truck Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Red or Black Car Radio Illumination Wire: Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 6′ Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Black/White Right Front Speaker Positive Wire (+): White/Green Right Front Speaker Negative Wire (-): Black/White Car Audio Rear Speakers Size: 6′ x 9′ Car Audio Rear Speakers Location: Rear Corners Left Rear Speaker Positive Wire (+): Pink/Green Left Rear Speaker Negative Wire (-): Pink/Blue Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Green/Orange