My radio isnt getting any power. i jus took it out of my other car and it was working. i only have a yellow, black, and remote, and the rest are speaker wires. am i missing wires in my wiring harness because im not getting any power?

Do these colors match your truck wire colors? Let me know if not or if you have more questions.

1991 Ford Ranger Pickup Truck Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Blue/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
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
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: N/A
Car Audio Rear Speakers Location: N/A
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

There may be extra wires you don't need. The basic set of wires on the radio is 4 pairs of colored wires--one black-striped and one plain for each speaker. Yellow is usually accessory power, red is hot, and black is ground. Some additional wires may be one for a power antenna, one for an external amplifyer, and one for facelight (in case it will run on dimmer)
The car should have the following corresponding wires:
Radio 12v--- orange
Radio Ground--- black
Radio Ignition--- yellow
Radio Illumination--- brown
Dimmer--- gray
Power Antenna--- pink (if you have one)
LF Speaker +/- tan - grey
RF Speaker +/- lt green - dk green
LR Speaker +/- brown - yellow
RR Speaker +/- dk. blue- lt. blue

The car or radio could have additional connectors, such as for a subwoofer, CD changer, etc.

two purple wires, speaker
two white wires, speaker
two gray wires, speaker
two green wires, speaker
black wire, ground
yellow wire, battery...for memory( goes to a constant 12V power source)
red wire, ignition, to pwr on when key is on
blue wire(remote wire if you have a system)

The wires in the radio are more likely:

RED : Main Battery Power
YELLOW : From Ignition Switch
BLACK; Ground
BLUE: Output for Accesory (Antenna o Amp)

Car;

Blue/Red: Main Battery Power
Pink/Black : From Ignition Switch
Yellow/Gray: Illumitation(Don't use)
Green/Black: Same

I may be able to email you a copy of the diagram (just to be safe...)

red-power(keyed), yellow-power(constant), Black-ground, Blue-remote(usually to amp), this is the basics to get power to the radio. The rest(white/white-black, green/green-black, gray/gray-black...are for speakers)

yellow constant
red switch
black is ground
blue power antenna if any
dimmer i/illumination is optional

front- right-red/green-+
front-left-blue/green-+
rear-right-red/yellow-+
rear-left-blue/yellow-+

these are all the positive side wire for all your spkr

Yes, your red wire is for ignition, yellow wire is for battery and black is ground. The red ignition wire is for the radio to turn off and on with the ignition. The yellow is always hot, for memory.

Here is the wiring info for your radio. I have some other wiring diagrams but did not see anything related to your ac. Hope it helps and let me know if you want the other wiring diagrams. Also once you know what these wires are then you will be able to tell what wires are not related to your radio and might be able to figure out which wires are causing your other problems?

Battery WHITE/YELLOW (+) RADIO HARNESS
Accesory WHITE/RED (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
Illumination RED/BLACK (+) RADIO HARNESS
Dimmer RED (-) RADIO HARNESS
Power Antenna YELLOW/WHITE(+) RADIO HARNESS
Amp Turn On YELLOW/WHITE (+) RADIO HARNESS
LF Speaker (+) WHITE
LF Speaker (-) ORANGE
RF Speaker (+) YELLOW
RF Speaker (-) BROWN
LR Speaker (+) RED
LR Speaker (-) GREEN
RR Speaker (+) BLUE
RR Speaker (-) BLACK
Amp Location MOUNTED TO BRACKET IN RIGHT SIDE OF TRUNK
Steering Cntrls YES
Speed Cntrl NO
Radio Security YES

Red - Power
Yellow - primary power must be joined to the red
blue - Remote
Black - ground or negative
To find your speaker wires check the color of the cord behind each speaker than match it with the same color in the dash.
or the easy way is to use a normal 1.5v penlight battery and try each speaker cord behind the dash and listen to which speaker give off a crackling noise so you can get the balance on the cd player right.
If u trying to find power in the car and don't have a tester than get a 12v light or bulb join the negative to the body and push the positive wire into each one of the holes in the factory plug in the dash one at a time until the light comes on. That is your positive the rest is easy. (DIY guru)

Here you go:


[POWER]
Red: 12 Volt switched
Yellow: 12 Volt Constant (FULL TIME FOR SETTINGS MEMORY RETENTION)
Black: Common ground
IF YOU HAVE AN ORANGE, it is for DASH BOARD lighting sense to dim the radio similar to the stock radio. (Best if snugly covered and isolated. and not used.)

Blue: System Power on sense for any amplifiers, also known as "P.CONT.", "rem.", or "remote wire"
Blue White: Power antenna up/down

[FRONT SPEAKERS]
White: Left Speaker POSITIVE (+)
White Black: Left Speaker NEGATIVE (-)

Grey: Right Speaker POSITIVE (+)
Grey Black: Right Speaker NEGATIVE(-)

[REAR SPEAKERS]
Violet: Left Rear POSITIVE (+)
Violet Black: Left Rear NEGATIVE (-)

Green: Right Rear POSITIVE (+)
Green Black: Right Rear NEGATIVE (-)