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I have a Volvo Service Manual for 1985 240. There is a page titled Ignition system, Turbo (TSZ-2). Maybe this will help.
Is this what you have:
From the coil is a BN (brown) wire on terminal #15 (which goes to the starter and gets power there), and a W-R (white-red) wire on terminal #1.
The W-R wire goes to a connector that is on the RH side, en route to the Control Unit.
It's a small, square connector. Two wires go in, W-R and W, and one comes out, W. The W goes to the control unit terminal #16. Apparently the coil fires when the ground side circuit is broken by the control unit.
The picture of the control unit shows 5 wires, in this order: GN, BN, BL, SB (black, ground), and W. Be sure the ground wire has a good connection. It is attached to the body behind the washer tank, along with the ground for the RF headlights and corner lights. The SB wire may not come direct from the control unit, but run along inside a harness for a small distance.
The BN wire that provides power to the coil comes from the starter. It has full power while the starter solenoid is engaged. When the solenoid disengages, the power to the BN wire comes via the ballast resistor. This is a tube-shaped thing with pointed ends and wires out each end, one BN and one BL. It is mounted on the RH side, maybe on the firewall.
If the ballast resistor is bad you get start but no run. Test by jumping the resistor.
If the coil ground side is open, you get no spark. The ground failure can be the control unit or the connection of the control unit to the car body.
Check that one first, it's a cheaper fix.
Good Luck,
Bob
:>)
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