I picked up a malibu the other day and theres no stereo and the wires aren't there so agsr I need to know is what power source to use for constant I think I can just ryin a write strait to the battery right and the ground I know how to do but what circuit should I use for the power so tgeee stereo is on only when the key is turned on its 1980 chevy malibu wagon so its pretty basic but any help appreciated