My guess would be foglights/driving lights too. They didn't come stock, but on the 4 Mark VIII's I've owned (parts cars included), 2 of them have had aftermarket relays/wiring for fogs (but neither of them had foglights- apparently taken off by a previous owner), and in both cases, the relays were mounted near the strut tower (on the driver's side, which makes sense because it's close to the battery). I put foglights on the 93 I had, in no small part because the stock halogen lights sucked, which probably explains why aftermarket foglights are so popular on these cars.