OK, for a start, my username is Volvodad - (all one word, unlike the poster who started this thread).
Second, I have put together and installed a daytime running light (DRL) setup on both my 240's which uses the high beam filaments only and runs the current for them through a high-wattage resistor so that they run at reduced intensity - about 1/2 power. Still plenty bright with the "high" beam pattern, and very visible to oncoming traffic. I wired them so that the relay that feeds them gets its signal from the accessory circuit (No. 1 fuse), so they cut out while the starter is operated. A small toggle switch on the dash lets you cut them off anytime you want (listening to the radio while parked). When you switch on the low beams the DRL's cut out (their relay is grounded via the low beam filaments). You need a diode in the circuit to prevent a backfeed into the ACC circuit when you have the low beams on. Sounds more complicated than it is. A good thing is that the only lights in operation are the high beam filaments - not wearing out the tail, park, dash, low beam, etc. bulbs.
IPD (and others) offer a low-beam DRL system which I don't like as it runs the low beams at full power anytime the ignition is on, and this means reduced life of those critical bulbs. And how do you push-start a manual car when the battery is down to its last couple of amps and you can't turn those lights off?
If I've got it right, it sounds like the system proposed by the original poster here would just prevent leaving the headlights on when you turn off the ignition? Does it include a time delay like some "luxury" cars? You may get more responses if you offer a bit more detail as to what the system would do.
I"m not trying to criticize the original poster, just to say that, yes, the Volvo headlight system can be improved upon, and there are many ways to skin this cat.
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