Install Aux. 1 Lamp
The Max Charge MC-612-Dual regulator’s Aux. #1 (#19) terminal pro-
vides the ability to use a visual indicator when the regulator is operating
under the following conditions: Full field (the alternator is working at 95%
or greater output) or Small Engine Mode (the regulator is being controlled
at 50% field output). When a described condition is detected, the regula-
tor sends the Aux. #1 terminal from neutral to ground. To utilize the Aux.
#1 Lamp function:
1. Connect a small LED or incandescent lamp (maximum current flow is
500 mA) to a positive voltage source.
2. Connect the negative terminal on the lamp to the Aux. #1 terminal on
the regulator.
Install Dash Lamp
The Max Charge Dash Lamp (#20) terminal provides the ability to acti-
vate a visual or audible indicator when the regulator monitors the follow-
ing conditions: Low system voltage, high system voltage, high alternator temperature and high battery temperature (tem-
perature conditions are only indicated when appropriate temperature sensors are connected). When a described condition
is detected, the regulator sends the Dash Lamp terminal from neutral to ground. To utilize the Dash Lamp function:
1. Connect a small LED or incandescent lamp, or an audible (piezo) alert
(maximum current flow is 500 mA) to a positive voltage source.
2. Connect the negative terminal on the lamp or audible alert to the Dash
Lamp terminal on the regulator.
3. When connected, the lamp should flash at regulator start-up to indi-
cate active status.
Magnetic Reed Switch
Looking much like a small thermometer atop the
regulator’s circuit board, the magnetic reed switch
provides a durable, sealed interface that enables
the user to set basic and advanced regulator pro-
gramming features. Included with the regulator is
a small screwdriver that doubles as the regulator’s
programming tool. A small magnet embedded in
the tip of the screwdriver’s handle allows the user to activate the magnetic reed switch. By holding the magnet to the RED
dot located at the end of the reed switch, the user allows the user to scroll through the regulator’s various program modes
and individual program selections.
Initial Pre-Flight Test And Start-Up
When the regulator is properly mounted and the regulator wiring is installed, the MC-612-Dual is ready for pre-flight test-
ing. Before turning on the engine, it is advisable to check voltages at the following terminal connections to ensure that the
wiring is correct. Test #1 verifies proper voltage values with the regulator turned off. Test #2 verifies the expected voltages
with the regulator turned on.
Note: If the regulator’s BROWN ignition wire is receiving it’s switched source of voltage from an oil pressure switch, it may
be necessary to start the engine before applying test #2. If the engine must be run to accomplish test #2, be sure that both
alternators are properly cabled on both positive and negative sides to the battery being charged. Failure to do so could
result in damage to the regulator and alternators.
Using your hand-held multi-meter, test the following wiring terminals for voltage:
TEST #1: Engine/Ignition Off
• Primary RED Power Wire (Terminal #5) >12V
• Secondary RED Power Wire (Terminal #4) >12V
• Positive Voltage Sense Wire (Terminal #12) >12V
• BROWN Ignition Wire (Terminal #3) 0V
• Primary BLUE Field Wire (Terminal #2) 0V
• Secondary BLUE Field Wire (Terminal #1) 0V
TEST #2: Engine/Ignition ON
• Primary RED Power Wire (Terminal #5) >12V
• Secondary RED Power Wire (Terminal #4) >12V
• Positive Voltage Sense Wire (Terminal #12) >12V
• BROWN Ignition Wire (Terminal #3) >12V
• Primary BLUE Field Wire (Terminal #2) 4-12V
• Secondary BLUE Field Wire (Terminal #1) 4-12V
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