2
FIGURE 2 - MC-12
™
MODULATOR TRAILER SYSTEM WIRING SCHEMATIC
Seven Conductor
Antilock
Wire Gauge
Pin
(Wire
Connector
Wire
Single/
Connector
No.)
Letter
Color
Lamp and Signal Circuits
Dolly Double Triple
1
1
C
White
Ground Return To Towing Vehicle
12
10
8
2
2
-
Black
Clearance, Side Marker and Identification Lamps
12
12
12
3
3
-
Yellow
Left Hand Turn Signal and Hazard Signal Lamps
12
12
12
4
4
-
Red
Stop Lamps
10
10
10
5
5
-
Green
Right Hand Turn Signal and Hazard Signal Lamps
12
12
12
6
6
-
Brown
Tail, Clearance, Side Marker and License Plate Lamps
12
12
12
7
7
B*
Blue
Auxiliary, Dome, Etc. or constant Antilock power
12
12
12
4
9
A
Red
Antilock Power From Stop Lamp
10
10
10
-
8
D
Yellow
Trailer Mounted Status Light
14/16
14/16
14/16
-
10/11
N/P
-
Wheel Speed Sensor
16/18
16/18
16/18
-
12/13
M/L
-
Wheel Speed Sensor
16/18
16/18
16/18
* Antilock Connector Pin B is an option and is used to provide constant power to the MC-12
™
modulator during trailer operation.
Trailer
Mounted
Status
Indicator
Marker
Marker
Marker
Marker
Clearance
Clearance
Wheel
Speed
Sensor
Marker
Marker
Rear 7 Pin
Connector
Plug (See
Note)
Wheel
Speed
Sensor
CI/Directional
CI/Directional
Stop & Tail
Stop & Tail
License Plate
Note:
The rear 7 pin connector plug is for Dolly operations for Doubles & Triples
To Pin “G” on
MC-12
™
Modulator
Connector
To Power Side of
Tractor Ignition
Tractor Electrical
Relay
Tractor Dash Mounted
Trailer Antilock Status
Lamp
The relay illustrated to the right is used when
a tractor, dash mounted status lamp for the
trailer antilock system is desired. Like the
trailer mounted status lamp, this is an option
and is not required.
