1. GROUND INPUT
(ALTERNATOR #2)
- Connects
regulator to system ground via alternator ground ter-
minal. BLACK wire included in Ford style plug.
2. GROUND INPUT (ALTERNATOR #1)
- Connects
regulator to system ground via alternator ground ter-
minal. Loose BLACK wire included in regulator wiring
harness or to second wiring harness.
3. POWER INPUT (ALTERNATOR #2)
- Supplies power
to operate the regulator and deliver field current to ex-
cite alternator. RED wire included in Ford-style plug.
4. POWER INPUT (ALTERNATOR #1)
- Supplies power
to operate regulator and deliver field current to excite
alternator. RED wire in second alternator harness.
5. IGNITION INPUT (ALTERNATOR #1)
- Connects to a
switched source of battery voltage (to ignition switch
or oil pressure switch. BROWN wire in regulator wir-
ing harness.
6. FIELD OUTPUT (ALTERNATOR #2)
- Provides exter-
nal (P-type) alternator field control for the secondary
alternator. BLUE wire in secondary wiring harness.
7. FIELD OUTPUT (ALTERNATOR #1)
- Provides ex-
ternal (P-type) alternator field control for the primary
alternator. BLUE wire in regulator wiring harness.
8. ALT. TEMP. #1 (-)
- For use with optional Alternator
Temperature Sensor (MC-TS-A).
9. ALT. TEMP. #1 (+)
- For use with optional Alternator
Temperature Sensor (MC-TS-A). Sensor lug connects
to rear case bolt of alternator, enabling regulator to
monitor and react to alternator over-temperature con-
dition. USE CARE TO ENSURE COR-
RECT PIN POLARITY WHEN CON-
NECTING SENSOR CABLE TO THE
REGULATOR.
10. BAT. TEMP. #1 (-)
- For use with op-
tional Battery Temperature Sensor
(MC-TS-B).
11. BAT. TEMP. #1 (+)
- For use with op-
tional BATTERY Temperature Sensor
(MC-TS-A). Sensor lug connects to
negative battery post, enabling regula-
tor to monitor and respond to battery
temperature condition. USE CARE TO
ENSURE POSITIVE AND NEGATIVE
WIRES ARE CONNECTED TO THE
APPROPRIATE REGULATOR TERMI-
NAL.
12. POSITIVE VOLTAGE SENSE
- Con-
nects to battery being charged. Use
RED fused pigtail connector (included)
at battery end of user-installed wire.
The POSITIVE VOLTAGE SENSE wire
MUST be connected for the regulator to
work.
13. DATA RX Capped. (Factory use only).
14. DATA TX Capped. (Factory use only).
15. STATOR IN
- Connect to WHITE wire included in regu-
lator wiring harness.
16. TACHOMETER OUT
- Connect to tachometer sender
wire when using stator output to provide a signal for
an electric tachometer. NOT REQUIRED when a me-
chanical tachometer is used.
17. ALT. #2 / BAT. #2 TEMP. (-)
- For use with optional
Alternator Temperature Sensor (MC-TS-A) or Battery
Temperature Sensor (MC-TS-B).
18. ALT. #2 / BAT. #2 TEMP. (+)
- User selectable circuit
can be used to temperature sense at a second alterna-
tor or a second battery bank. Requires either optional
MC-TS-A or MC-TS-B sensor cable. USE CARE TO
ENSURE POSITIVE AND NEGATIVE WIRES ARE
CONNECTED TO THE APPROPRIATE REGULATOR
TERMINAL.
19. AUX. #1 LAMP
- provides a source of ground under the
following conditions: Full Field (the alternator is work-
ing at full power), Small Engine Mode (the regulator is
being controlled at 50% field output), or Equalization
Mode. Connect to negative terminal of audible alarm or
lamp. 500 mA maximum.
20. DASH LAMP
- provides a source of ground under the
following conditions: Low charging voltage (<12.5V),
high charging voltage (>15.5V), high alternator temper-
ature (>105°C), or high battery temperature (>52°C).
500 mA maximum.
MC-612-DUAL Regulator Terminal Layout
- 3 -
2
1
3
4
5
7
6
