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Alternator Terminal Identification Chart

TERMINAL TYPICAL FUNCTION
Main Power Connections
B+ , 30 Battery Positive
B- , 31, D-,GRD Battery Negative
EEarth - Battery Negative
F, 67 Field/Rotor
F Field/Rotor
FLD Field/Rotor
EXC Excitatation Field/Rotor
DF External control for Field current of Rotor
Terminals connected to Stator windings
C Central Point of windings (check with manufacturer)
NNull - Central Point of stator windings
WWave - Tachometer rev counter sensing (stator single phase tap AC output from one of the stator windings),
PAC Phase Output from one of stator windings used for tachometer rev counter sensing
STAStator
Spare terminals
DDummy terminal mainly used on Japanese alternators
N/CNo Connection
D+, 61 , L , IND,Charge Warning Lamp
IIndicator (as Charge Warning Lamp)
ILIllumination (as Charge Warning Lamp)
IG, 15 , R , Ignition
BVS , S, M, 2, Battery Voltage Sense
Communications Terminals
DFM , SIG, C, M, Digital Field Monitor duty cycle output for computer control unit monitoring. Use oscilloscope or specialist equipment to test signal
SIG Signal - duty cycle output for computer control unit monitoring. Use oscilloscope or specialist equipment to test signal
FR Field Report (Load control output)
RLORegulated Load Output
RVCRegulated Voltage Control
LIN Local Interconnect Network bi-directional control to control module
COMBi-directional digital communication line used by control module to control the alternator, and alternator to send status messages back to controller. Use oscilloscope or specialist equipment to test signal. Bit Serial Device (BSD) protocols such as BSS and LIN may be used for serial data communication with engine control module.
CCommunication (*Check with manufacturer)
BSSBit Synchronized Signal

Please Check the manufacturers instructions for specific application of wiring terminal designation. Information collaborated from various sources including product catalogues and test equipment manufacturers.

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