no crank on 1.8 audi a4 on 1997 Audi A4

Have a no crank situation on 97 a4 1.8 engine.Car will start if I turn ignition on and jump starter leads.I have bought 2 manuals, neither one shows complete wiring diagram. It appears switch is ok when checked.I dont have wire diagram as wires leave transmission and by the fuse relay

Asked by for the 1997 Audi A4
Sounds like starter/solenoid problems.