In a 2006 Ford Ranger, the common wire colors for the radio are as follows: the power wires typically include a yellow wire for battery positive (12V constant), a red wire for ignition/accessory (12V switched), and a black wire for ground. The speaker wires usually consist of various colors, such as white and white/black for the front left speaker, gray and gray/black for the front right, green and green/black for the rear left, and purple and purple/black for the rear right. Always refer to a wiring diagram specific to your model for accuracy.
Possible bad ignition switch
yes
Replace the radio.
The 2006 Ford Ranger 3.0 liter V6 has ( 148 horsepower )
You can find the 2005 Ford Ranger radio CD player wire color codes in most service manuals. The wire colors are associated as follows; the positive wire is red, the black wire is the ground, the green and yellow wires are speaker wires, and the white wire is the auxiliary wire.
In a 2006 Ford Ranger : The ( SuperCab ) is ( 73.8 litres / 19.5 U.S. gallons )
with a crowbar
On a 99 ford Ranger it is located right next the radio on the drivers side behind the dash. Remove the radio and you will see in bolted on the left side of the radio hole.
yup
You can get a 2006 Ford Ranger body part diagram at your local auto parts store. Another option is to contact the Ford dealership.
Go to : http://www.cthreepo.com/blog/2009/09/swapping-the-radio-in-a-ford-ranger.shtml
It`s a Ford.