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There are two possiblities I can think of.
(1) The alternator brushes are about worn out. The brush/regulator unit can be removed and checked in situ. If the brushes are under 5mm long, replace them. The total unit is about $80 from a dealer, I have never checked for aftermarket availability. As an electrical part, it will be non-returnable if it turns out that you don't need it. The brushes alone can be replaced and are available from the Parts Bin. Takes some skill with a soldering iron.
(2) The wire that connects the ground side of all those flickering warning lights to the D+/61 spade lug terminal on the alternator is grounding intermittently. That circuit grounds through the brushes so that when the alternator begins to charge the ground is lost and the lights go out. The oil pressure light is separate.
Look at the wires exiting from the harness behind the alternator. The fat red one is not usually damaged. The other two, red to D+/61 on the alternator and black to the oil pressure sender, frequently suffer from failing insulation. Very Visible.
As long as the bare spots don't touch anything, no problems. I have replaced those two wires on every 240 I have ever owned. The under-the-engine routing is fraught with heat, oil, road crud, and dry-out which, when combined with the Volvo hare-brained idea about environmentally friendly insulation, damn near guarantees failure for 1983 thru 1988. Volvo fixed the problem in 1989. Sorry.
Run new wires from their respective user terminals to the gray connector on the firewall, routed along the fenders. Just leave the old wires isolated.
Good Luck,
Bob
:>)
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