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INSTALLATION BY WIRE
NOTE: Must install wires listed on this page for regulator to operate.
INSTALL BLACK GROUND WIRE
The BLACK Ground Wire #1 in diagram at right is included in the four-wire Ford-style plug on the wiring
harness and is factory installed on regulator packages designated with “H” at the end of the model
number. The other end of the Ground Wire is fitted with a ring terminal connector. In most applications,
this wire can be connected directly to the alternator’s ground terminal post. For best accuracy ground as
close to the battery as possible.
Both the alternator and regulator must be connected to system ground.
INSTALL RED POWER WIRE
The RED Field Wire #2 in diagram at right is included in the four-wire Ford style plug and is factory
installed on regulator packages designated with “H” at the end of the model number. The other end of
the Power Wire is fitted with a butt connector. This MUST be installed to a 12V battery. DO NOT connect
This MUST be installed to a 12V battery. DO NOT connect
to a 48V battery.
to a 48V battery. When a diode-type battery isolator is used, the power and wire must be connected to
the battery side of the battery isolator. Power Wire is equipped with 10-amp ATC type fuse. The Power
Wire must be fused to ensure against damage to the voltage regulator.
INSTALL BROWN IGNITION WIRE
The BROWN Ignition Wire #3 in diagram at right provides ON/OFF voltage for the regulator. This
MUST BE a 12V power source. This wire is included in the Ford-style plug at the regulator end of the
wiring harness. The other end of the wire is fitted with a butt connector. Typically, the ignition wire is connected to the ON side
of the ignition switch. This may be at the actual switch, or to a wire in the existing engine wiring loom that delivers switched
voltage from the ignition switch. In some cases, an oil pressure switch may be used to activate the regulator. In either case, the
regulator’s ignition wire must see zero volts when the engine ignition is switched off. This must be an isolated switch functioning
as a relay. Switches with a positive and negative connection will not work.
INSTALL BLUE FIELD WIRE
The BLUE Field Wire #4 in diagram at right provides regulated current to control alternator output. The wire is included in the
wiring harness Ford-style plug and is pre-connected at the regulator. At the other end of the wire, you’ll find a ring terminal.
Attach the field wire to the alternator’s field terminal.
INSTALL ALTERNATOR TEMPERATURE SENSOR
Because of the high-power output of the 96-Series alternators, the use of the Alternator Temperature Sensor (MC-TS-A)
is required. It is NOT included in the harness and must be purchased separately. It allows your MC-620 voltage regulator
to monitor your alternator temperatures and limit output if safe operating levels are exceeded. The MC-620 uses active
temperature regulation to maximize high-temperature output. The MC-TS-A sensor includes a 54” cable, a sensing attachment
lug, and positive and negative regulator plug-in connectors. To install the MC-TS-A:
1.
Connect the sensor lug to one of the four bolts that hold the alternator’s front and rear cases together. Extend the sensor
cable to the regulator. The cable can be included within the regulator’s wiring harness, or can be run alongside the harness
and attached with cable ties.
2.
Connect the temperature sensor to the Alt. Temp. terminals on the regulator. It is
essential that the terminals are connected to the correct pin. Connect the red wire to the
positive terminal #6 and the black wire to the negative terminal #5.
INSTALL POSITIVE BATTERY SENSE WIRE (48V)
The included voltage sense wire length is designed to sense at the B+ terminal of the al-
The included voltage sense wire length is designed to sense at the B+ terminal of the al-
ternator. For the most accurate voltage sensing and better charging performance, consider
ternator. For the most accurate voltage sensing and better charging performance, consider
extending the voltage sense wire to run directly between the regulator and the 48V battery
extending the voltage sense wire to run directly between the regulator and the 48V battery
bank. This method is also used if using a battery isolator, or sensing at another location such as a battery switch (Anywhere
bank. This method is also used if using a battery isolator, or sensing at another location such as a battery switch (Anywhere
other than the alternator.)
other than the alternator.)
1.
Attach the included wiring pigtail with 1-amp fuse to a length of wire of sufficient
length to reach the desired sensing
location. If the length of the wire
between the regulator and the sensing location is 8’ or less, a 16-gauge wire is
satisfactory. If the wire exceeds 8’, increase the wire size to 14 gauge.
2.
If the batteries are connected to a battery isolator, the positive sense wire must be connected to the battery side of the
isolator, preferably at the larger of the battery banks. If you do not sense at the battery, use the included sense wire to
read at the B+ stud at the back of the alternator. It features a ring terminal at the alternator end and a female quick connect
terminal at the regulator end. This wire is fused at the alternator end with a 1-Amp ATC-type fuse and fuse holder. The wire
MUST be connected at the (#9) Positive Battery Sense Terminal. To complete installation of the sense circuit
Crimp the
included spade terminal to the sense wire and reconnect the spade to the (#9) pin.
Magnetic
Reed Switch
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14
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1
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Magnetic
Reed Switch
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16
15
14
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10
9
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6
5
1
2
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