The MC-612 can be installed with very little difficulty if installation instructions are followed carefully. If you are unaccustomed
to marine electrical installations, we recommend a licensed marine electrician. To install the MC-612:
1. Mount the regulator in a dry, well-ventilated location, well away from hoses and exhaust manifolds which may cause dam-
age to the regulator or wiring. Avoid areas of heat and/or high vibration.
2. The RED wire (in the harness) powers the regulator. Attach at the positive output terminal at the back of the alternator. If an
isolator is used, this wire must be located on the battery side of the isolator. On a 12V system, this wire can carry 8 amps
and must be protected by a 10-amp fuse. A fuse is
included with the wiring harness.
3. The POSITIVE battery sense wire, as shown in the illus-
tration at right, monitors battery voltage. The positive
sense wire should be connected 1) at the battery, if only
one battery is being used; 2) at the "common" terminal
of the battery selector switch for multi-bank charging; or
3) on the isolator terminal for the largest battery bank
(if isolator is used). This wire is user supplied and
should be 16-gauge. Spade and ring terminals, and a 1-
A inline fuse are provided. The positive and negative
sense wires MUST be connected for the regulator to
work. Refer to regulator side label for terminal locations.
Caution: Sense wires MUST always see the battery
being charged. Be sure to observe polarity when con-
necting.
4. The BROWN (ignition) wire activates the regulator when
+12VDC is applied to the system. Attach the BROWN
wire to a sw12VDC source. The auxiliary side of
the ignition switch, or an independent (ungrounded) oil pressure switch are both acceptable connection points. A toggle
switch may be added to this circuit to shut down the alternator load in cases where maximum propulsion is needed.
5. Attach the Ford-type harness plug to the regulator (see illustration). The second BLACK (ground) wire in the harness attach-
es to the Negative Battery Sense Terminal. Both BLACK wires attach to preferred ground terminal on the alternator.
6. Plug duplex plug with BLUE (field) and White (stator) wires into rear of alternator.
7.
Plug the other end of the WHITE wire into the Stator Terminal on the regulator
(see side label for locations of these and other terminals). Tach Terminal on
the regulator provides pulse for electric tachometer, if desired.
The MC-612 is factory preset for use with most battery types. For optimal charging,
we recommend choosing one of the six battery-specific selectable programs dis-
cussed on Page 4 of the installation manual. Program choices are: 1) Universal
Factory Program, 2) Flooded Deep-Cycle, 3) Gel Cell, 4) AGM, 5) Optima, 6)
Standard Flooded, and 7) for Halogen and voltage sensitive applications. To enter
a battery program.
1.
Activate the preset program mode by placing the magnetic screwdriver (or
pencil magnet) as shown at left. The white dot at the top of the display indi-
cates the switch is activated.
2.
The “Pro” display appears, followed by the cycling of the battery type codes.
When your desired battery type is displayed, release the switch by removing
the magnet.
3.
Should you need to alter your choice, activate the switch again with your
magnet and release as soon as your desired program is displayed.
4.
The “Pro” code will display, followed by the “SAV” code, once the switch is
released. The regulator is now set for your battery type.
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Max Charge MC-612 Quick Installation Instructions
