hi m8 suzukis run a postitive earth system sound like thats ur problem also look under the dash on the passenger side there maybe a elec board somethimes this fuses its self
hope this helps
simon
NO car in production uses a positive earth system!
Its probobly one of the headlamp relays has become spotwelded. Get your manual or ask about, find out which it is and pullit. If that fixes the problem you can try changing the relays. These are ISO standard units so go pilch one out of an Escort or something :)
If it persists you neex to trace back the switch to the relay. I suspect what Gen-X meant is that the -Ve side is interrupted by the switch not the + side so you need to find out why its not being de-energized.
If it stays on with the relay out you might have the harness wiring being pulled down to earth someplace, go look for shorts :)
Only thing I wish I had a haynes manual for is the wiring diagrams.