here's the alarm/remote start info
1986-93 Mercedes 300 Series Security Information
Constant 12V+ Red Ignition Switch Harness
Starter Purple/White or Purple Ignition Switch Harness or from Console
Ignition Pink/Red or Pink/Black Ignition Switch Harness
Ignition 2 Pink/Yellow Ignition Switch Harness, Accessory 2
Accessory Pink/Green Ignition Switch Harness
Tach Black Or Gray/Yellow (-) At Coil left inner fender
Brake Switch Black/Red Brake Switch
Trunk Pin Black/Yellow (-) OEM Alarm Module Passenger's FootWall
Parking Lights Gray/White L And Gray R at Light Switch
Head Lamp White/Yellow Light Switch
Hood Pin Brown/Red (-) OEM Alarm Module Passenger's FootWall
Factory Disarm Green/Yellow (-) OEM Alarm or Driver's Kick Panel
Door Trigger Brown/ (-)F ,Brown/ (-)R at OEM Alarm right FootWall
Door Lock Green or Blue Driver's Kick or Pump under Rear Seat
Door Unlock Green or Blue Vacuum Door Lock System
Horn Wire Black/Yellow (-) Steering Column
Windows Up LF=Green, RF= Black/White
Windows Down LF=Black/Pink, RF= Black
All this information is from the
www.the12volt.com database and I don't assume any responsibility for it's accuracy.