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I'm with Bill's post below.
The starter circuit is about as simple as a light bulb. Mechanics that can't fix this probably shouldn't be mechanics.
I believe it's a blue green wire that goes to the solenoid from the inhibitor switch. If there's no voltage there when someone turns the key to start, the starter won't go... probably because the inhibitor switch is toast. It can be intermittent, and the switch is a not uncommon problem here.
Cure is to replace the inhibitor switch, or bypass it altogether (which is how manual transmission 740's are wired from the factory). FYI, If you bypass it, the car will start in gears other than park or neutral.
1990 wiring diagram is here:
http://oak.cats.ohiou.edu/~ridgely/Volvo_docs/
I'd be glad to help more if you need it.
-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 299k, Regina, 23/21mm Turbo Sway Bars Buckeye Volvo Club
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