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There is often a weak connection where the bulb holder contacts the circuit boards, clean the board with a pencil eraser, and bend the bulb holder contacts toward the board just a wee bit.
Check the contacts inside the bulb holders. Also check the connector that hooks the wiring harness onto the circuit board. It can be opened up, and the wires carefully removed and the endings cleaned and squeezed a tiny bit tighter. Avoid getting them mixed about in the connector.
In my Volvo Wiring diagram manual for the 1985 240, no fog lights show up. The lower outer and lower inner lights on a rear light assembly are the tail or marker lights. Only the upper inner shows as a brake light.
When the Fed sed that beginning in 1986 "Thou shalt have a high level brake light" Volvo putzed around with the tail light panels something wonderful.
Beginning in 1986 the lower outer got a dual filament bulb holder and became a combination tail and brake light. The lower inner stayed a marked light. The upper inner became a fog light, 21W bulb controlled from that dash switch just below the headlight switch. On only with low beams. Also, turning off the ignition on the 86 + turns off the headlights, nice. Oh, and they put a hight level brake light up in the rear window, too. It IS in the Bulb Failure Warning System.
The bulb failure sensor relay can sometimes cause weird problems, too. Check by (at night) backing into a parking spot where you can look in the rear view mirror and see the rear lights reflected like in a store window. Try the brakes, and give the bottom of the dashboard a gentle upward whack between the door and the steering column.
Another thing is the brake light switch. It is down by the brake pedal pivot. You can jump the switch and see if that makes any difference.
Good Luck,
Bob
:>)
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