Shift Box PLUS, BASIC, LITE Installation Instructions

1990 DSM's

Wiring instructions:

• IMPORTANT NOTE: If used with a TCU or other method of controlling the transmission, follow the instructions closely. Only one way of controlling the transmission should be powered on at one time to prevent unexpected control of the transmission or damage to the TCU. Use the supplied switch to switch between transmission controls or substitute a suitable relay. Updated!
• If the transmission shifts from 1st to 4th to 3rd to 2nd, then the shift solenoid wires are reversed

Using the Shift Box BASIC as a standalone transmission controller:

• Red wire is +12 volt power from the ignition switch
• Black wire is ground, connect to a good clean chassis ground
• White wire splices with the Tacho output from the ECU
• Yellow wire goes to the Shift Solenoid A
• Brown wire goes to the Shift Solenoid B
• Optional wires for external shifter control:
  White/Black wire is the shift input common (sensor ground) for use with an external shifter
  Purple wire is the up-shift button (short to white/black wire to perform up-shift)
  White/Purple wire is the down-shift button (short to white/black wire to perform down-shift)
• Any remaining wires should be capped

Using the Shift Box BASIC with TCU or other transmission controller:

• Red wire is +12 volt power from the ignition switch, connect as follows using switch harness
  
  * NOTE: On the fuse block there are 2 wires from the TCU fuse, both must be cut and spliced together through the supplied switch harness to prevent the TCU from being powered when the shift box is being used.
       Red wire to Green switch harness wire
       Yellow switch harness wire to fuse block harness (Power from TCU fuse)
       Brown switch harness wire to fuse block harness (This will power the TCU)
   
• Black wire is ground, connect to a good clean chassis ground
• White wire splices with the Tacho output from the ECU
• Yellow wire goes to Shift Solenoid A
• White/Yellow wire goes to the TCU Shift Solenoid A output
• Brown wire goes to the Shift Solenoid B
• White/Brown wire goes to the TCU Shift Solenoid B output
• Optional wires for external shifter control:
  White/Black wire is the shift input common (sensor ground) for use with an external shifter
  Purple wire is the up-shift button (short to white/black wire to perform up-shift)
  White/Purple wire is the down-shift button (short to white/black wire to perform down-shift)
• Any remaining wires should be capped

Wiring Diagrams