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had the same issue a few days ago. sometimes start then not. Then definitely not.
replaced PNP switch with another one I had that worked. Still nothing.
So, I got smart and downloaded the starting circuit diagram. Extremely easy to diagnose.
Ignition switch to alarm relay (mustn't forget this) and if you added an aftermarket alarm, then the relay would be in the same circuit (serial), then to the PNP switch, then starter.
So, first, get a voltmeter and place a wire on the green wire at the starter solenoid. Turn the key and see if 12 volts appears. If not, then it's not the starter. If yes, then either 1) ignition switch, 2) alarm relay, or 3 PNP switch.
Now to rule out the PNP switch, place the voltmeter wire on the starter service connector and turn the key. If 12 V appears, then it is the PNP switch that is bad.
If not, then check the alarm relay before replacing the ignition switch.
Following so far? It is a series circuit. 1) ignition switch to alarm relay to PNP switch to starter in series.
If it is the PNP switch, then remove it (easy), open it up if it is the original and clean the contacts. You will be amazed as to how simple this switch is inside. it's just contacts that slide when you change the gear lever.
My problem was the starter. 12vcd appeared at the green wire at the solenoid and no click or anything. removed the starter and I had a spare solenoid (new), the the screws tips were stripped and I couldn't remove them. sigh! so, new starter and no more problem.
If you print out the volvo 850 circuit diagram for the starter you will see how easy this circuit really is. I described it above, so it is really simple.
Also, the volvo alarm relay is complex, but many people also add an after market alarm that is also in the same series circuit killing the starter. Check the relays, clean them and make sure you are getting 12 vdc at the green wire at the starter.
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