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Installation by Wire
Install BROWN Ignition Wire
The BROWN Ignition Wire (#1 in diagram at right) provides the ON/OFF voltage for the
regulator. 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
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. Voltage on the ignition wire may be 12V or 24V.
Install RED Power Wire
The RED Power 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 ring terminal connector. In most
applications, this wire can be connected directly to the alternator’s positive output post.
When a diode-type battery isolator is used, the Power (RED) 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 ORANGE Stator Wire
The ORANGE stator wire (#3 in diagram at right) provides a source of AC stator output voltage which is used by the
regulator to assist in voltage regulation. The regulator end of the stator wire is included in the black four-wire plug,
which is pre-installed on the voltage regulator.
When the tachometer is connected via the MC-624, the regulator will ensure that the tachometer will not discontinue
supplying field current when the batteries are fully charged. When connecting the tachometer to the alternator
stator output, it will be necessary to determine the number of poles in the alternator in order to properly adjust your
tachometer. Most Balmar alternators feature 12-pole rotors and stators, though, in some cases, the pole count may
be 14. See alternator manual for specifics. See your tachometer manual for adjustment instructions.
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 either a plug or a ring terminal, depending on the alternator’s field terminal connection. Attach the field
wire to the alternator’s field terminal.
Install Alternator Temperature Sensor
To optional Alternator Temperature Sensor (MC-TS-A) allows your MC-624
voltage regulator to monitor your alternator temperatures and limit output
if safe operating levels are exceeded. 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 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
match the polarity of the regulator connection pins. Connect the red wire to the positive terminal (#5) and the black
wire to the negative terminal (#6)
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Magnetic
Reed
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