Minor radio woes

restoring a1983 Transam daytonna pace,installed original radio,radio works but loses all settings after car is turned off,wiring diagram in haynes etc doesnt show wich wire is constant hot,yellow and black are ignition,their is also a pink and a grey,grey goes to clock according to diagram,although this car has no clock,anyone know what wire is originally constant hot.

If grey is said to go to clock, then it could be used as your constant. As far as the color codes on the back of the radio i don't know which you would connect it to. What are the color codes on the head unit itself?