Installation guide: CalAmp TTU 28XX on Fleet

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Skill level: Advanced

Installers must have a working knowledge of vehicle electrical and starting systems, and know how to use relays, diodes, sensor inputs.


Estimated time for install: 15-30 minutes

This article outlines how to install all CalAmp 28XX series powered asset trackers.

It covers:

Preparing for installation

Before you install the device, there are a few things that you need to do to ensure a smooth installation process.

Check the box contents

You should receive the following:

  • CalAmp 28XX

Get your fleet ready

We recommend installing the device outdoors in an area with good network coverage.

Gather your tools and supplies

Depending on your vehicle type, you might need some of the following tools:

  • Dash panel removal tools
  • Wire stripping tools
  • Digital voltmeter
  • Cordless drill
  • General purpose screwdriver bit set
  • Sockets (standard/metric)
  • Work light
  • Electrical tape - Super 33 grade or better
  • Extra zip ties
  • Extra self-tapping screws
  • Extra heat shrink ring terminals, butt connectors, and a mini-torch
  • Add-A-Circuit fuse adapters

Installing the device

1. Identify parts of the device


The device has a multi conductor cable with bare ends.


The vehicle tracker is equipped with two Status LEDs, one for GPS and one for COM (wireless network):

  • C: GPS LED (Green)
  • D: COM LED (Amber)

2. Choose where to mount the device

The device must be mounted:

  • In an area that’s clear of moving parts.
  • With a clear view of the sky.
  • Ensure any holes made to pass cable are properly insulated.
  • It is recommended to run a bead of silicone at the base of the device when exposed to the elements.
  • Do not place directly under metal.

3. Record the Equipment Serial Number

Record the device ESN. You need this along with the vehicle details, to verify the installation.

The ESN label is on the bottom of the device.

4. Connect the wires of the power harness to the asset's electrical system

DO NOT connect the power harness to the vehicle tracker at this time.

Using the asset tracker with an asset which has an ignition source requires 3 connections: GROUND, IGNITION, and POWER.

Using it with an asset with no ignition source requires only 2: POWER and GROUND. In these cases, you can ignore step 3.

1. Connect the ground line wire (black) to the body or frame of the asset, for example the chassis.

2. Use a ring terminal to terminate the ground wire to the chassis with a self-tapping screw or a factory bolt.

3. Connect the ignition input wire (white) to an ignition source that will only receive power when the ignition is ON.

5. Connect the power input wire (red) to a battery source where there is constant power, even when the ignition is OFF.

6. Connect directly to the asset battery terminal or as close to it as possible. This connection point should be fuse protected to not more than 5 amps.

To determine a true ignition power source:

  • Select a wire.
  • With the engine OFF, use a voltmeter to measure the DC voltage on the wire. It should show 0 volts.
  • Turn the key to the Accessory position. The voltage should still show 0 volts.
  • Turn the key to the On/Run position. The voltmeter should show 12 volts.
  • Crank the motor and make sure that the voltage does not drop below 9 volts.
  • While the asset is running, confirm that the voltage on the same wire is 12 volts or higher.
  • Turn the asset’s engine OFF and confirm that the voltage on the same wire is 0 volts.

Tip: If the voltage does not display as indicated here, you are not testing a true ignition wire.

If the installation requires extending the harness’ ignition wire outside the cab and directly to an alternator or solenoid, protect the wire and connection using a heat shrink ring terminal, dielectric grease, and wire loom along with a weatherproof fuse holder, and fuse of 3-5 amps.

5. Confirm that the asset tracker is connected correctly

Check the device’s LEDs.

Green LED (GPS)

  • Off = GPS OFF
  • Blinking = GPS connected

Orange LED (Com)

  • Off = Modem OFF
  • Slow blink = Ignition OFF
  • Fast blink = Ignition ON, searching for network

Installing sensors

Temp Probe


  1. The temp probe wire (white / blue) should be connected to the blue wire from the probe.
  2. The brown wire from the probe should be terminated to a ground common to the device.
  3. The Ignition wire should be terminated to a Refer on/off source.

Digital inputs


  • Terminate this wire to the desired input. This could be, PTO, BOOM, REAR DOOR, or a light.
  • Inputs should switch between (-) and (+), or (-) and open polarity.
  • A relay may be required for installation.

Input wires:

Blue wire = designated for PTO

Orange/blue wire = designated for Boom

Verifying operation

To verify operation, use the Fleet Hardware Installer app. If you experience any issues with the Fleet Hardware Installer app, contact support.


Verizon Connect shall have no liability whatsoever for any damages that arise from, or are connected with, your use of our services, including the GPS tracking hardware and dash cams, in a manner contrary to the(se) instructions or in violation of law and/or our agreement. Tracking hardware connected to the diagnostic port in any vehicle that has third-party devices also connected to the diagnostic port can cause interference or loss of functionality of the third-party device. These third-party devices include, but are not limited to, wheelchair lifts, lifesaving equipment, emergency lighting, and radar guns. If such a conflict exists, contact Verizon Connect support to have the tracking hardware configured to support the third-party device. Failure to do so relieves Verizon Connect of all liability for damages that arise from or are connected with your use of the devices. Installed devices may only be removed and transferred to another vehicle if the second vehicle has been tested for compatibility, as per the(se) instructions. Transfers between vehicles which do not follow the(se) instructions will void any and all warranties from Verizon Connect, and relieve Verizon Connect of all liability for damages that arise from or are connected with your use of the devices.

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