I see you have 2 threads going on this same problem with different info. To narrow down the problem why not just run a test jumper from battery plus to the small wire on the starter solonoid and see if starter kicks over. That tells you if the problem is in the starter or the neutral/keyswitch circuit. By the way there are no relays in that circuit. A starter can fail gradually or without warning. have tried whacking with a hammer?
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David Hunter

You can also use a remote starter switch to test starter/starter solenoid. Pull blade terminal (#50) from solenoid. (I'm working off memory from a 740, but I am assuming it is similar for a 940.) Connect one end of remote starter to the blade on starter solenoid and other end to battery +. Turn ignition to "On." Hit remote starter button. Engine should start. If it does, trace back in ignition key circuit and neutral safety switch for fault. If no start, starter solenoid/starter is at fault.

Do you have a wiring diagram?

Easiest thing to check is to pull the teeny wire off of the starter solenoid and check for voltage when someone turns the key. If there's voltage, problem is the solenoid or the starter. If no voltage, the problem is the safety switch or ignition switch.

As for bypassing the safety switch, a wiring diagram is handy to ID the wires, but you can go blindly by pulling the center console, finding the multi-pin connector, and running a jumper from one pin to the starter pin.

-Ryan
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Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars