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F. Install Positive Battery Sense Wire
Included with the MC-612’s wiring harness kit is a fused wiring pigtail which features
a ring terminal at one end and a butt connector at the other. In the center is a 1-Amp
ATC-type fuse and fuse holder. This wire must be connected at the Positive Battery
Sense terminal located at the center of the regulator’s circuit board. See terminal #2
in diagram at right. A female quick connect plug has been pre-attached on terminal
#2 for connection of the positive battery sense wire at the regulator. To complete
installation of the sense circuit:
Identify the favored location for battery sensing. In most instances, the positive output of the alternator, the
common side of a battery switch, or the positive post of the battery being charged will
work best. If the batteries are connected to an isolator, the positive sense wire must
be connected to the battery side of the isolator, preferably at the larger of the battery
banks. If the length of the wire run between the regulator and the sensing location is
8’ or less, a 16-gauge wire is satisfactory. If the wire run exceeds 8’, increase the wire
size to 14 gauge.
D. Install Ground Wires
Two BLACK Ground Wires are included in the regulator’s wiring harness. One of
the two wires is connected via the Ford-style plug (#4 in diagram at right). The
other is connected at the independent terminal shown (#3 in diagram at right).
Both wires are connected to the regulator at the factory. The other end of each wire
is fitted with a ring terminal. Both wires should be connected at the alternator’s
ground terminal. See your alternator’s instruction manual for the ground terminal
connection point.
G. Install Ignition Wire
The BROWN Ignition Wire (#6 in diagram at right) provides the ON/OFF voltage
for the regulator. This wire is included in the Ford-style plug at the regulator. 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 the 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.
E. Install Power Wire
The RED Power Wire (#5 in diagram at right) is included in the four-wire Ford-
style plug and is factory installed on the regulator. The other end of the Power Wire
is fitted with a ring terminal connector. In most applications, this wire can be con-
nected directly to the alternator’s positive output post. In an isolator is used, it will
be necessary to connect the ring terminal to the battery side of the isolator. The
Power Wire should be connected to the same location as the Positive Battery Sense
Wire (see below). The Power Wire features a 10-amp ATC type fuse and fusehold-
er. This wire must be fused.
H. Install Field Wire
The BLUE Field Wire (#7 in diagram at right) provides the regulated voltage to the
alternator required to excite the rotor and stator and control alternator output. The
Field wire is included in the Ford-style plug and is pre-connected at the regulator.
At the other end of the wire, you’ll find either a plug or a ring terminal, depending
on the alternator’s field terminal connection. Attach the field wire to the alterna-
tor’s field terminal. See your alternator manual for any specific requirements your
alternator may have.
Summary of Contents for Max Charge MC-612
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