This product is connected directly to the vehicle’s 12-volt system. There is no on-off switch on the unit. The installed unit operates 24 hours a day and must be energized to log vehicle events or send data as required by anyone using the service.

The MLU is shipped with one in-line 3-amp fuse attached to the power cable. This fuse must be installed as close as possible to the primary 12-volt source connection. The fuse protects the power cable should there be a short in the cable between the fuse and the MLU. This fuse must be installed properly. If the fuse is replaced, it should be of the same type as originally supplied from the factory. The original fuse supplied is a 3 amp 125-volt type 3AG (Little Fuse 321 Series).

Failure to use the proper fuse or to install the fuse in the recommended location could cause a vehicle fire hazard. The fuse provides overload protection for the power cable and MLU. The wiring installed between the fuse and primary vehicle power is not protected from overheating if a short should occur. Use care when routing the power cable and fuse. Route the cables where they will be protected and uses commonly accepted install practices for after market automotive electronic devices.

There are two acceptable methods of making a wire connection:

• Soldering your connections (recommended)


• Crimp connectors (with the use of the proper crimping tool)

Regardless of the method you choose, ensure that connection is mechanically sound and properly insulated. Use high quality electrical tape or shrink tubing, cheap tape will unravel in hot weather making it a poor insulator.

Never use "t-tap" connectors (poor quality mechanical type connection)
Never "twist and tape" without soldering your connection

There are two antenna cables in addition to the main cable harness that must be connected to the MLU, so be sure there is room to access the connectors for installation and service.

The unit has a diagnostic wire and LED that will be used to verify operation by the installer. These items are normally not used by the owner.

Satellites are in a 12-hour orbit at 12,000 miles above the earth. There are 24 satellites in the system and generally there are at least 5 satellites orbiting overhead at any one time. This antenna must be positioned to receive signals from these satellites. The antenna location must be selected carefully so that the antenna can receive the satellite signals. The standard GPS antenna is designed to be located inside the vehicle. The ideal location is in a place that allows line of sight reception from the GPS satellites in orbit above. The satellite signals will pass through glass if it is not coated with a metallic film. Both the radio transceiver antenna and GPS antenna is designed to be mounted inside the vehicle, (not exposed to the outside weather).

If an exterior installation location is required you will need to use the optional antennas designed for exposure to the outside elements.

Connect the red lead or fuse end of the power cable to the +12 volt vehicle power. The power cable can be shortened if needed but be sure to also install the in line fuse.

Connect the black lead to the vehicle chassis (ground).

If you need to shorten the power cable or reconnect the in-line fuse, the wires can be removed and reattached by unscrewing the ends of the fuse holder and inserting the new wire. The holder accepts a 1/4-inch striped stranded wire that is untwined. Tighten the fuse holder ends by securely tightening by hand.

The ideal location is under the dash board. It can be placed under the dash pad as long as the pad or covering is not metallic or a barrier to the GPS satellite signals.

If the vehicle window has a solid dark coating around the edge, do not place the GPS antenna behind the coating. The GPS signals will travel through the clear glass but will be reduced if the window has any metallic coating or tint applied.

The GPS/RF Combo antenna will work best if it has a clear view to the sky and as much of the horizon as possible. Any metallic objects between the antenna and the satellites will degrade the signal and reduce the overall performance.

Remember that the MLU will remain in the test mode for only 5 minutes at a time and you will need to cycle the test wire to re-enter the test mode. The MLU interface circuits are all pre-wired in the cable harness. Table 1 also shows the wire colors associated with the input and output circuits. The digital outputs are provided to switch optional external devices. Each can sink 1 amp at 35 volts. The outputs are voltage protected so they can sink current from inductive loads. If the individual sink current is allowed to exceed 1 amp, the outputs could be damaged. The digital inputs are triggered by a contact closure or short of less than 100 ohms from the contact to ground on their inputs.

• Turn on your computer and log on to the Internet using your standard Internet browser.


• Go to the Direct-track home page at cargpstrackingsystems.com


• Choose the applicable site from drop down menu.


• Enter customer login and password. Then click login.


• You will now be on the Control Panel page.


• Select the vehicle which will be tested.


• Click on the Vehicle Location Request button to obtain a location, speed and direction. This step is to ensure proper functionality of the MLU.


• A map will generally appear on average of about 2 min. Make sure the information on the map is correct.


• Zoom in/out on the map by using the circular buttons located on the bottom right hand corner.

Optional features to test are located on the Control Panel (i.e. Door unlock, Starter Disable, and Geo Fence)