1987 mustang head unit install problem

i have a 1987 mustang i just got and it had a stereo previosly installed with rca monster cables going to the amps in the back but for power the harness is chopped up and 3 wires are dangling a yello a red taped up and a green also there is one random purplishblue wire thicker gauge than the rest but not from the same place the harness was i have a sony head with universal harness how can i splice the wire what should be connectted to what for power any lead will help im in no way a car stereo expert... but i can do easy harness stuff its a no brainer... this is out of my leauge. thanks for any help-alex

Ok..you'll need at least a digital multimeter for this to at least check for continuity. You want to check the wires with the key in the ignition and in the "On" or "ACC" position and without the key in the ignition.  The wire you find that gives you a 12 volt reading with the key in the "ACC" position you can connect to the red wire on the Sony head unit.  And then connect the ground wire to a good clean point on the car's chassis .  If the car has the factory colored wires, you could use this  wiring diagram to find your connections.  But you still need to have a Muiltimer to check for proper voltage.  Duane...

If you think you're confused, imagine how you feel.   

cool id been looking for wiring diagram your the man thanks-alex

not a problemDuane...

If you think you're confused, imagine how you feel.