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Could be any of the ignition switch, PNP (neutral) safety switch on the side of the trans shifter or the starter solenoid/motor. I've had all three with both my 940s in the past few years.
You need to try isolating the problem, starting with the simplest:
o Is the starter motor solenoid attempting to click when you turn the key? If it is then suspect the starter, a weak battery or corroded main connection.
o If toggling the key fully on/off and retrying the ignition switch a few times, maybe even forcing the key a little bit harder causes it to catch and you're not touching anything else (especially don't touch the shift lever) then suspect the ignition switch. If you can almost always get it to crank again by doing this then almost certainly the ignition switch.
o If putting the shifter in Neutral or moving the shift lever around in the P or N positions now allows it to crank then almost certainly the PNP switch. Start by running the shift lever fully back and forth a number of times in an attempt to shift any grunge out of the way preventing good contact. Then try turning the key while wiggling and leaning on the shifter left then right, then forward then back in both the P and then N positions.
o If tapping solidly quite a number of times on the starter motor body with a solid piece of wood like a broom handle or 2x2 now allows it to catch then it's likely a sticky solenoid or dead spot in the starter motor (either way, just replace the whole starter). Often times the starter motor only causes occasional starting problems that slowly get more frequent. When that was last happening to me I started packing around a piece of wood for a few weeks until I could arrange to replace it.
After that you will want to do some electrical troubleshooting. Simplest thing to start with is shorting the main terminals on the starter to see if it now catches. Failing that you would then begin tracing with a meter to see how far 12 volts is getting through the ignition switch and through the PNP switch to the starter solenoid.
More info in the FAQ and do some searching of old posts here for tips, especially the easy and hard ways to get the ignition switch off and as well the PNP switch.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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