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Additional Regulator Features
Small Engine Mode
In situations where additional power is needed for propulsion, the MC-624 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 Temperature Sensor terminals.
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
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 terminal
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 Alternator #1
Temperature Sensor terminals (terminals #5 and #6).
4. Add appropriate connectors to the switched wires and connect to the positive and negative
terminal connections.
Dash Lamp
The MC-624 provides a Dash Lamp circuit that’s capable of providing a signal to a user supplied and installed audible
or visual alert if the following issues were to occur while the regulator is in operation;
• Low Battery Voltage <25.6V
• High Battery Voltage >31.0V
• High Alternator Temperature >225˚F (Requires installation of MC-TS-A sensor cable.) Temperature adjustable.
• High Battery Temperature >125˚F (Requires installation of MC-TS-B sensor cable.)
System Troubleshooting
Regulator Troubleshooting
The majority of charging difficulties can be attributed to damage, corrosion or wear at wiring, fusing or wiring
connections. Please note: the regulator will not produce field output if the system voltage is below 22V.
Please
ensure that voltage is above 22V when testing the system for proper operation.
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 continuity. 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 fuse 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 prob-
lems are a result of a faulty alternator or regulator. These tests provide an opportunity to isolate the alternator, regu-
lator and wiring harness in order to determine the problem source. In order to perform these tests, you will need an
independent DC meter (preferably a digital type). In an emergency, a 12V or 24V 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.
