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Similar to Randy's jumper wire (which made your starter work) Volvo has provided a "Service Socket" under the hood for remote starter operation. See photo:

The Service Socket connects to Starter terminal 50 by way of the Neutral Safety Switch (NSS) if car has Auto Transmission.
If a jumper wire from Battery + to the Service socket energizes the starter, then the NSS must be OK, leaving the Ignition switch as the likely cause of your starter problem.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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