CalAmp TTU-3640 Installation Guide

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This article will assist you in successful installation and validation of telematics devices using the CalAmp TTU-3640 according to the configurations designed by Utilimarc Telematics. The part number for this device is "TTU3640LAW"

Kits using this device contain the parts pictured below:


Step 1:  Record Vehicle / Equipment Information

If the unit data is not already associated with the device, the first step of the installation is to record the following information prior to plugging the telematics device into the vehicle:

  • Unit number

  • VIN Number or other Serial Identifier

  • IMEI/MEID/ESN Number located on the back of the device

  • Current vehicle odometer reading, if applicable

  • Current vehicle engine hours, if available

The vehicle data should be recorded on our online fillable form.

Please fill out required fields (Company Name, Unit ID, ESN located on the back of the CalAmp device, VIN, Odometer Reading) and submit the form. You will receive an emailed summary of the action taken from once it is complete.

More information for the fillable form can be found here.


Step 2: Plan the Installation

Verify Power, Ground and Ignition: Be sure to check each source (power, ground and ignition) to ensure that the proper signaling exists. This is typically accomplished with a multi-meter.

  • The power signal should be representative of the vehicle battery voltage.
  • The ignition signal should provide voltage only when the ignition is engaged.
  • The ground signal should be connected to chassis ground.

Before drilling any holes or running any wires, decide where each hardware component will be located. Be sure that the power cable to the TTU is not bent or constricted in any way.

The best way to ensure a trouble-free installation is to consider your options and make some decisions before you start.

Take a look at the vehicle and determine how to best install the TTU for the following purposes:

  •  Accurate data gathering and simulation of how customers actually use the solution
  •  Ongoing monitoring and maintenance of TTU equipment
  •  Prevention of accidental or intentional alteration of the equipment or cable connections

Device Placement: Attach the TTU to the solid body of the vehicle or other rigid surface, preferably not to plastic panels. The TTU can be placed out of sight by removing trim and molding to expose available space, then replacing the trim once the TTU is in place.

Though the TTU3640 is IP67 weatherproof rated, it is best to install it in a location out of harm's way. Typical installations will place the TTU in an enclosed compartment on the equipment if possible. As this device contains an internal antenna, do not install it within a metal container, as this could obstruct the GPS signal. Make sure you can get access to the unit afterwards as it may be necessary to troubleshoot the installation or add additional wiring or connections to the TTU.

Status LED lights on the front of the TTU unit can provide valuable information about its operation. When feasible, attempt to install the TTU in such a way that these lights can be seen with reasonable ease.

You may find it useful to be able to view the LEDs periodically to make sure that the TTU is operating properly. If at any time you should encounter a problem with the TTU, you may need to read the LEDs in order to troubleshoot the problem. If you cannot fix the TTU yourself, you will need to provide the LED information to Utilimarc customer support.


Internal Antenna: As mentioned earlier, the TTU-3640 has internal antennas and does not require an antenna to be installed.

Vehicle Hardware Input Signals: The TTU-3640 provides up to 4 inputs. The standard wiring harness for this kit is a custom build providing only power, ground, and ignition connections. If additional I/O is required, contact a Utilimarc representative to discuss custom cabling and device configuration options.


Step 3: Device Installation

Connect power, ignition, and ground: The power input (red wire) must be connected to a constant (un-switched) +12 VDC or +24 VDC supply; preferably, connected directly to the vehicle battery terminal or as close to it as possible. This connection point should be fuse protected to not more than 5 Amps. The ignition input (white wire) must be connected to the vehicle ignition or another appropriate key operated line, ensuring that power to the ignition wire is available only when the vehicle ignition is on. The ground line (black wire) must be connected to chassis ground.

For best results, it is strongly recommended that the TTU connection be on its own circuit. Connect the power input directly to the vehicle battery if possible and protect the circuit with an inline fuse. If you must connect through the fuse box, use standard commercial wiring practices to create a permanent installation.

Below are the parts of a kit using the 3-wire power cable, as it should be connected in a standard installation:


Make sure that the 3-wire power cable you are using has the part number CC-095. There is a previously available custom 3-wire cable for the LMU-4520 with part number CC-067 that will appear to fit this device, but the wires are configured to a different pinout and will not be compatible with the TTU-3640. 

Step 4: Data Validation

(See Data Validation article)

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