Additional Regulator Features
Small Engine Mode
In situations where additional power is needed for propulsion, the MC-612-DUAL provides the option to manually reduce
regulator field output by approximately one half. This option, called Small Engine Mode, can be accessed by creating a
direct pathway between the positive and negative Alternator #1 Temperature Sensor ter-
minals. This can be done by splicing into the positive and negative wires of the Alternator
Temperature Sensor cable (MC-TS-A) with a switched wire. With the switch in the OFF
position, the Alternator #1 Temperature Sensor will work normally. With the switch in the
ON position, the regulator will reduce field output by approximately 50%.
To enable the Small Engine Mode:
1. If the Alternator Temperature Sensor cable is being used, replace the female termi-
nal connectors on the cable with Multi-Stack Connectors (Ancor Part # 230612).
2. Install a standard ON/OFF switch in a location that’s easily reached from the helm.
3. Run wires from the switch back to the positive and negative terminals of the Alterna-
tor #1 Temperature Sensor terminals.
4. Add appropriate connectors to the switched wires and connect to the positive and
negative terminal connections.
Dash Lamp
The MC-612-DUAL provides a Dash Lamp circuit that’s capable of providing a signal to a user supplied and installed au-
dible or visual alert if the following issues were to occur while the regulator is in operation;
• Low Battery Voltage <12.5V
• High Battery Voltage >15.9V
• High Alternator Temp. >225
˚
F/107
˚
C (Requires installation of MC-TS-A sensor cable.) Temperature adjustable.
• High Battery Temp. >125
˚
F/52
˚
C (Requires installation of MC-TS-B sensor cable.)
Follow the instructions provided on Page 6 of this manual when installing.
Aux #1 Lamp
The MC-612-DUAL provides an Auxiliary Lamp circuit that’s capable of providing a signal to a user supplied and installed
audible or visual alert to indicate the following while the regulator is in operation:
• Small Engine Mode is activated,
• Regulator is at full field.
Follow the instructions provided on Page 6 of this manual when installing.
System Troubleshooting
Regulator Troubleshooting
The majority of charging difficulties can be attributed to damage, corrosion or wear at wiring, fusing or wiring connec-
tions. Before attempting to troubleshoot alternator or regulator issues, be sure to address the following:
1. Remove and clean all charging system electrical connections (positive and negative). Check the voltage regulator’s
harness for resistance. Wires and terminals can and will become corroded, and need to be cleaned or replaced.
Ensure that the regulator’s ground wires are provided with a clean connection to system ground.
2. Inspect and replace 10A and 1A ATC type fuses in the regulator wiring harness if fuses appear to be damaged or
corroded. Ensure that the fuse holder is also free of corrosion.
3. Charge all batteries to their proper fully charged state, and determine if they are serviceable. If your batteries are
flooded-type, use your hydrometer to determine their condition.
4. Check and tighten alternator belt. If the belt show signs of wear or damage, replace it. Always replace existing belts
with the finest quality replacements available.
If batteries and wiring are in suitable condition, use the tests on the following page to determine if charging problems are
a result of a faulty alternator or regulator. These tests provide an opportunity to isolate the alternator, regulator and wir-
ing harness in order to determine the problem sourrce. In order to perform these tests, you will need an independent DC
meter (preferably a digital type). In an emergency, a 12V light bulb or test light can be used to help determine if power or
working grounds exist. An amp meter and a battery hydrometer with a thermometer are also helpful diagnostic tools.
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