Install Battery #1 Temperature Sensor
The optional Battery Temperature Sensor (MC-TS-B) enables the regulator
to monitor for changes in ambient battery temperature, and adjust charging
voltages to suit. The MC-TS-B sensor assmbly includes a 20-foot cable, a
sensing attachment lug and positive and negative regulator plug-in connec-
tors. To install the MC-TS-B:
1. Connect the sensor lug to the battery negative post closest to the cen-
ter of the battery bank. Extend sensor cable to the regulator
2. Connect the positive and negative female connectors to the Battery
temperature sensors on the regulator (#10 is NEGATIVE. #11 is POSI-
TIVE). NOTE: Wire terminals must match the polarity of the regulator
connection pins (red wire to positive terminal and black wire to negative
terminal).
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 con-
nected at the #12 Positive Battery Sense terminal A female quick connect
plug has been pre-attached on the terminal #12 pin. To complete installa-
tion of the sense circuit:
1. 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 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.
2. Attach the included wiring pigtail with 1-amp fuse to a length of wire of sufficient to reach from the regulator to the
desired sensing location. 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.
3. Remove the female 1/4” spade terminal from the terminal #12 pin. Crimp the spade terminal to the sense wire and
reconnect the spade to the #12 terminal pin.
Data TX and RX Terminals (#13 and #14)
Are currently for factory use only, and are capped to protect against accidental connection.
Install WHITE Stator-In And Tach-Out Wires
The alternator’s stator output provides the electrical pulse needed to drive the tachometer. The MC-612-DUAL provides
regulated tach output when the WHITE stator wire is connected to the regulator’s Stator In (#15 in diagram) terminal and
the outfeed wire to the electric tachometer is connected to the Tach Out terminal (#16 in diagram).
Most Balmar alternators feature 12-pole rotors and stators, though, in some cases, the pole count may be 14. See alterna-
tor manual for specifics. See your tachometer manual for adjustment instructions.
Install Battery #2 / Alternator #2 Temperature Sensor
Your Max Charge MC-612-DUAL voltage regulator can accomodate either alternator or battery temperature sensing on
terminals #17 and #18, depending on your preference. When controlling two alternators with the MC-612-DUAL, the use
of a secondary alternator temperature sensor enables the regulator to respond to over-temperature conditions at the
second alternator. Used in conjunction with an optional MC-TS-B battery temperature sensor, the regulator can monitor
temperature at a secondary battery bank, and respond to a battery over-temperature condition by discontinuing charging.
To install a secondary temperature sensor:
1. Select the optional sensor that best fits your application.
2. Connect the temperature sensor to the secondary alternator or battery bank following the directions provided for the
primary alternator or battery temperature sensor.
3. Plug the sensor cable BLACK (negative) wire to #17 and RED (positive) wire to #18. Select the program setting in the
voltage regulator’s basic program mode that corresponds to your sensing selection.
CAUTION:
Reversing the polarity of the terminal connections on any of the alternator or battery temperature
sensors can result in invalid sensing and potential damage to alternators, regulator and/or batteries.
- 5 -
