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Volvo changed a lot of things over the years, but my 83 factory wiring diagram book supports Bruce's comments...the front parking lamps are not part of the BFS circuit. Some BFS modules are extremely sensitive and making a supposedly unrelated change could correct (or cause) a BFS problem.
..somewhat unrelated, but Bruce opened the topic... I have rewired both kids' 240's for daytime running lights so that the inner high beam bulbs illuminate at one-third-power whenever fuse #1 is 'hot' (Key in position I or II, but not III), headlights are turned off, and parking brake is off. Reduced power is achieved by wiring a 1.33-Ohm, 60W resistor pack in series with the DRL relay's feed to the bulbs.
Advantages:
-the low beam filaments - obviously the most important headlight elements - are not used as DRLs, so will last longer;
-the high beam DRLs , even at low power, are visible WAY down the road, warning oncoming traffic not to attempt a pass on two-lane roads, or cross traffic not to pull out from a stop sign;
-at 35% power the filaments should last approximately forever.
A side benefit is that my double relay setup bypasses the resistor to provide full battery voltage to the inner high beams (ie: brighter) when they are switched on at night, and their current draw is removed from the already overtaxed headlamp switch. (Perhaps this is not a factor on later, plastic-lensed 240's with just two high beam filaments and a relay on the light switch.)
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)
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