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Arrangement and assignment of underbody ground points - GF00.19-P-2000-10I

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MODEL 463 with ENGINE 112.945 Left-hand steering 

MODEL 463 with ENGINE 113.962 Left-hand steering 

Fig 1: Arrangement And Assignment Of Ground Points - Underbody
G07712396Courtesy of MERCEDES-BENZ USA
Ground point Designation Component Designation Conn. pin
W30  Ground, frame  → E3/1 Rear foglamp  
→ E7 Reversing lamp
→ M3 Fuel pump
→ S76/8 Rear axle differential lock indicator switch
→ W42 Ground, body
  Without optional trailer coupling → E19/1 Left license plate lamp G
→ E19/2 Right license plate lamp
  Optional trailer coupling → X18/12 License plate lighting connector 2
    → X58 Trailer coupling socket, 13-pin 3
    → X58 Trailer coupling socket, 13-pin 13
  as of 1.6.98 → X58s2 Backup assist shutoff microswitch 1
  Optional BA → X26/26 BA connector 3
  Optional STH → X74 Main wiring harness/fuel metering pump connector, 2-pin  
  up to 31.5.98      
  as of 1.6.98 → Y23 Stationary heater (STH) fuel metering pump  
W42  Ground, body  → W30 Ground, frame