Help no logic input voltage going into ficm
2003 6.0 friends truck had stereo stolen they didn't trash it too bad but since then it will not start I have no logic input voltage to FICM if I give it voltage at the 10a fuse the FICM puts out a nice 48 volts and starts fine as soon as I take away power dead I have tried darn near everything to trace the this circuit and am now plum outta ideaers