MFJ MFJ-4418, Instruction Manual

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Controls and Indicators:
1 2 3 4 5 6 7
Figure 2 Side View
1.
Boost On/Remote
: This switch enables the Battery Boost function when in and when
out enables the Remote Boost Enable feature.
2. Over Current LED : Lights when over current sense is tripped.
3.
Low Input LED
: Lights when input is below the preset minimum input voltage.
4. Boost Enable LED : This LED is illuminated when the Switching Regulator is enabled.
5. Remote Control : This Jack allows the MFJ-4416BRC Remote Control and metering
unit to be attached to the MFJ-4418. This allows remote monitoring of the Input Voltage
and Output Voltage. It also allows Remote Enabling and Audible alarm of the MFJ-
4418. Perfect for remote placement of the MFJ-4418.
6. External Boost Enable : This connector allows remote enabling of the booster from an
ignition switched line, the radio amp key line, or other remote devices
7. USB : The port to connect a computer for setting up the MFJ-4418 and monitoring the
MFJ-4418 functions.
Not shown on the back side there is a ground lug available for chassis grounding.
CONNECTION AND OPERATION
Mounting
Place the MFJ-4418 in a dry, out of the way place, where air can circulate over the heatsink. Do
not mount it in a location where it can get wet. Place it in a location where the case can be
grounded with short ground leads.
DC Power Connection:
The MFJ-4418 is designed to boost voltages as low as 9.5V up to 13.8V at up to 30A peak. At
high currents the voltage drop from even large gauge wires can be appreciable for even short
runs. It is recommended to use a large gauge wire (such as #8 or #10) to reduce the voltage drop.
Connect the wire to the battery or other high current terminal on the vehicle for best results.
Connection to the lighter jack or a smaller fuse block is not recommended because of the smaller
gauge wires used in the automotive wiring harnesses. A fuse in the positive line near the battery