Nothing magic about the Crossfire.

I'd start by putting a meter or test light on terminal 50 on the starter solenoid to see if it's getting power when the key is turned to Start. If it's getting power, then the problem is most likely the starter.

If there is no power, you need a wiring diagram (Alldatadiy.com) to start working through the current path (ignition switch, trans lock-out, etc.).

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe