D Group 37 Wiring diagram Component wiring diagram FH12, FH16 LHD Component wiring diagram FH12, FH16 LHD Starter system, current supply, engine preheating 24 V FH12, Ul - unit injector, exhaust brake, exhaust pressure governor FH16, EDC - electronically controlled fuel injection, exhaust brake, exhaust pressure governor Full beams, dipped beams, parking lights, side marker lights, roof lights and tail lights Foglights Spotlights Brake lights Exhaust brake and compression brake Direction indicators, hazard warning lights Reversing lights Loading light, fifth wheel light Roof sign (standard cab) Roof sign (high cab) Interior lights, instep lights, bunk lights and luggage compartment lights, 24 V socket Ashtray light, cigarette lighter 12 V socket 2