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EMR
3
- Truck Installations
EMR4 Truck Installation
Input Power – Critical Ground Connection
Input Power – Critical Ground Connection
On some vehicles, the battery minus terminal, BAT(-), may not be common with the chassis ground or the defined
vehicle ground located in either the accessory panel or in the power distribution box. In this case, directly run the
ground connection for Input Power at J8, Pin 2 (GND) terminal as shown in Figure 22, directly to the BAT(-)
terminal connection point.
Proper operation of the EMR4 hardware depends on the quality of the ground connection from the Interconnect
Box to the source of INPUT-PWR power.
If the INPUT-PWR connection is made at the accessory panel, it must be fused at 5 amps. The installer must
ensure that a minimum of 12.0 volts, between the INPUT-PWR terminal and the GND terminal, is available from
the power source. If an improper ground point is used for input power to the EMR4 there may be insufficient
power for the Display Head to operate properly resulting in various E## error codes or possibly a blank display.
Pay careful attention to the wiring labels on both the EMR4 Display Head and the Interconnect Box.
Each connection must be made according to the wiring tables listed in this manual. Use shielded
cable to connect each device to the Interconnect Box and Display Head and ensure that each cable
jacket is resistant to gas and oil.
Installations With High Amperage Devices
The input power for an EMR4 must be isolated from devices that use large amounts of electric current such as reel
motors. Connect the EMR4 using dedicated wiring between the voltage source and the Interconnect Box. On
vehicles with multiple voltage sources it may be necessary to use a separate battery or voltage source to power
the EMR4. Also, a battery isolator can be used between the voltage source and the IB to prevent voltage spikes
from entering the Interconnect Box when the high amperage devices are de-energized.
Recharging Vehicle Batteries
In the Interconnect Box, disconnect the wires for both the INPUT-PWR and GND Terminals while charging the
vehicle’s battery. Failure to do so can result in hardware damage to the circuit board inside the Interconnect Box.
NOTICE
NOTICE
