VMX Installation Guide
9
Connecting the power cable
1. Connect the power cable with the DB26 pin connector to the back of the MDT. The smaller,
white molex end of this cable will be used to fish down to the location of the fuse box. This
corresponding mate of the 3 wire power cable will plug into the power pigtail.
2. Attach the white wire to the positive terminal.
3. Attach the red wire to the battery positive terminal.
4. Attach the black wire to the battery negative or ground.
Power management information
When the ignition is on, the MDT should power on before starting the
engine.
When the ignition is off, the radio is on and the GPS is on for 1 fix of every
60 minutes.
If the battery voltage drops below ~10.9 volts at the battery (10.5 volts at
the VMX: TREQ MDT), the radio and GPS are both off.
On the first power up, it is normal for the MDT to display a connection
message for the first few seconds. It will then ask for the vehicle
number.
Failure to install VMX: TREQ MDTs properly can result in damage to
vehicle ECM.