What are the colours of the cables for permanant live switched live and ground with relation to car stereo?

Did you bridge the new stereo into the truck using the factory original radio circuit or from another live connection? Does the new stereo have a permanent power wire and where is it hooked up to? Is the battery flat? Trace the wiring mod you have done back to the fuse block and ensure you have left all the factory connections working. Check your fuses and relays so you haven't accidentally grounded a live circuit and damaged something. Best way to go is using an adapter harness like this -
86 93 Select Mazda Ford Mercury Radio Harness to Aftermarket Stereo...

brown is permanent live blue is ground and red is on and off live

Red 12v permanent live.
Yellow 12v switched live.
Black ground earth.
blue/white amp or power antenna
yellow/black mute
speakers
white front left (-)
white/Black front left (+)
Grey front right (-)
Grey/Black front right (+)
Green rear left (-)
Green/Black rear left (+)
Violet rear right (-)
Violet/Black rear right (+)

This site may help you The Install Doctor The Do It Yourself Car Stereo Installation Resource...

Not sure if you mean the plug is cut on the car or the radio. The colour code is pretty uniform , so its easy with a meter to identify permanent 12V, switched 12V and ground. Whats left will generally be speakers and aerial power lead if you have a power aerial.

red wire is live (battery) yellow wire live only when ignition is on, black wire is earth(car body) there should also be 4 pairs of wires green,white,grey and purple these are your speaker wires you'l notice with the pairs of same colour eg white one is solid colour one has a black stripe the solid colour goes to live + on your speaker the one with stripe goes to - on speaker, same goes for the rest of the pairs hope this helps

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

use a 9volt battery and grab only speaker wires only and touch them to the 9vt battery this will tell witch speaker is witch. for mor help please call 419 689 1114 for futher assistance i will be more then happy to help you

Car Radio Constant 12v+ Wire: Blue/Yellow
Car Radio Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
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 (+): Pink
Left Front Speaker Negative Wire (-): Violet
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White

Here are the radio wire colors of the whole system, please rate this solution.

2007 Pontiac G6 Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox for switched power or use the brown wire (+) at the ignition wire harness.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Pink
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 (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

test all gronds and powers then the remaining cables use a AA batterie and conect one cable on each end on the baterie like on of on of like toching at times and that will make the speakers to sound for a little then you will identify every speaker then read the diagram on the radio and plug it in acording to the radio diagram