Need help with 2000 defender, burnt out light switch, fitted new switch now have parkers working but headlights only work on hi beam flash as before switch replacement. Have power out of headlight switch (blue wire) but no power coming in on blue wire to dip switch. Have no wiring diagram in my workshop manual. Where does blue wire go between light switch and dip switch? Have checked fuses and relay all seem ok, Any help greatly appreciated my only vehicle.