| Connector 1: | Air Brake Dryer (JTU) | 
| Connector 2: | Low Air Pressure Switch - Primary | 
| Connector 3: | Low Air Pressure Switch - Secondary | 
| Connector 4: | Park Brake Switch (JE4) | 
Connector Part Information
  | 
Terminal Part Information
  | 
Pin  | Wire Color  | Circuit No.  | Function  | 
|---|---|---|---|
A  | BN  | 541  | Ignition 3 Voltage  | 
B  | BK  | 350  | Ground  | 
Connector Part Information
  | 
Terminal Part Information
  | 
Pin  | Wire Color  | Circuit No.  | Function  | 
|---|---|---|---|
A-B  | --  | --  | Not Available  | 
C  | BK  | 350  | Ground  | 
D  | D-GN/WH  | 2662  | Low Air Pressure Switch Signal  | 
Connector Part Information
  | 
Terminal Part Information
  | 
Pin  | Wire Color  | Circuit No.  | Function  | 
|---|---|---|---|
A-B  | --  | --  | Not Available  | 
C  | BK  | 350  | Ground  | 
D  | D-GN/WH  | 2662  | Low Air Pressure Switch Signal  | 
Connector Part Information
  | 
Terminal Part Information
  | 
Pin  | Wire Color  | Circuit No.  | Function  | 
|---|---|---|---|
A-B  | --  | --  | Not Available  | 
C  | L-BU  | 1134  | Park Brake Switch Signal  | 
D  | BK  | 750  | Ground  |