Mercedes Benz  420 Sel 1986-1991
 PART   COLOR  LOCATION
 12 VOLT CONSTANT   RED (+)   @ IGNITION SWITCH HARNESS
 STARTER  PURPLE (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  PINK/BLACK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  PINK/GREEN (+) (2nd ACCESSORY  @ IGNITION SWITCH HARNESS
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  PINK/YELLOW (+)  @ IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  N/A  
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  N/A  
 PARKING LIGHTS ( + )  GREEN/WHITE (+) and GRAY (+) Use both, See NOTE #1  @ HEADLIGHT SWITCH
 POWER LOCK  BLUE or GREEN, See NOTE #2  See DIAGRAM
 POWER UNLOCK  LOCK/UNLOCK are Same wire, See NOTE #2  IN DRIVERS KICK PANEL
 DOOR TRIGGER  BROWN/GRAY (-) and BROWN/GRAY/BLACK (-) Use both, See NOTE #3  @ PIN SWITCHES
 DOMELIGHT SUPERVISION  BROWN/GRAY (-)  @ PASSENGERS PIN SWITCH
 TRUNK RELEASE  N/A  
 SLIDING POWER DOOR  N/A  
 HORN  BLACK/PINK (+)  @ STEERING COLUMN HARNESS
 TACH  BLACK (AC)  @ IGNITION COIL
 WAIT TO START LIGHT  N/A  
 BRAKE  BLACK/RED (+)  @ BRAKE PEDAL SWITCH
 FACTORY ALARM DISARM   GREEN/YELLOW (-)  @ THEFT MODULE in PASSENGERS footwell
 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. These wires are in a BLACK tube comming out of the Drivers Door. NOTE #3: the BROWN/GRAY (-) is at the RIGHT PIN SWITCH is for the FRONT DOORS, the BROWN/GRAY/BLACK (-) is at the REAR PIN SWITCH is for the REAR DOORS When connecting to an ALARM SYSTEM, use both DOOR TRIGGER wires and DIODE ISOLATE. to connec, See DIAGRAM