Mercedes Benz  300 D 1990-1992
 PART   COLOR  LOCATION
 12 VOLT CONSTANT   RED (+)   IGNITION SWITCH HARNESS
 STARTER  PURPLE/WHITE (+)  IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  BLACK/RED (+)  IGNITION SWITCH HARNESS
 IGNITION 2  N/A  
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  PINK/GREEN (+)  IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  N/A  
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  N/A  
 PARKING LIGHTS ( + )  GRAY/WHITE (+) and GRAY (+) Use both, See NOTE *1  @ HEADLIGHT SWITCH
 POWER LOCK  BLUE or GREEN, See NOTE *2  See DIAGRAM
 POWER UNLOCK  Same wire, See NOTE *2  
 DOOR TRIGGER  BROWN/GRAY (-)  @ PASSENGERS PIN SWITCHES
 DOMELIGHT SUPERVISION  USE DOOR TRIGGER  
 TRUNK RELEASE  N/A  
 SLIDING POWER DOOR  N/A  
 HORN  N/A  
 TACH  BLACK  @ DIAGNOSTIC CONNECTOR or IGNITION COIL
 WAIT TO START LIGHT  N/A  
 BRAKE  BLACK/RED (+)  @ SWITCH ABOVE BRAKE PEDAL
 FACTORY ALARM DISARM   GREEN/BLUE (-)  @ THEFT MODULE
 ANTI-THEFT  N/A  
 EXTRA INFORMATION
 NOTE *1 this vehicle has 2 Parking Light wires that will require 2 extra Relays part #775, to connect, See DIAGRAM. NOTE *2 this vehicle has a Vacuum Door Locking System that will requires 2 extra relays part #775, the wire is a the Drivers kick panel or at the pump under the rear seat, to connect, See DIAGRAM.