D Group 37 Wiring diagram Component wiring diagram FH12, FH16 LHD Drive axle load increase Drive axle load increase with time limitation Bogie press, 6x2 air suspension Bogie load, 6x4 air suspension with time limitation Left-hand unit in instrument panel (standard design) Central unit in instrument panel Right-hand unit in instrument panel (standard design) Left-hand unit in instrument panel (Driver Information System — DIS) Combination instrument (Driver Information System — DIS) Anti-lock brakes (ABS), 4-channel Level control, headlights Extra fuses Connection of extra switch, rheostat Earth connections ADR (battery master switch, current limiter, emergency stop) ADR cab heater (DL1C) 5