I put Euroheadlights in both my wife's '93 (DJAuto, with 55/60 H4) as well as my own '93 (Cibie-Volvo, with 80/130 H4), both using a relay system, and in both cars never had a problem with the bulb failure warning, nor would I expect any issue.

In my relay systems, the original wiring for the headlights only goes a set of four relays: one for low beam and one for high beam, each pair on each side of the car (so that if there's a relay failure, I'll still have the headlight on the other side working). In other words, as far as the car's wiring is concerned, the headlights are only lighting some very, very low wattage but identical bulbs :-).

My understanding is that the warning system relies on a difference in current between left and right sides, but since the only loads on the system are the tiny coils inside identical relays, the warning system should never be activated. Isn't that right?



Also shown above, in addition to the headlight relay, extra relays for fog lights as well as the waterproof fuse holders (one for low and another for high beams) and other "stuff" :-).