Hi Phil,
First you should ditch Haynes and find the Volvo wiring Diagram for your model year. The 1989 book is TP31383/1 Dunno the number for the other years.
Hunt your book down (PDF) online, or hard copy at Ebay. They come and go.
Hard copy is the best.
The ignition switch pin 50 (Pink) does supply the +12V to the starter solenoid
via Pin 4 of the start inhibitor switch connector then pin 3 (Blue Green) to the solenoid.
You just need to confirm with your ohmmeter that the switch is closed when in park position and open in other positions.
If the inhibit switch is not closed in park, it wont start.
Bill
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