Posted by Peter Kennedy on 12/13/2018 to
Alternators
This key might be helpful to identify the terminals on your alternators, as you can see the same function can have different designations depending on the make and model of alternator
| Terminal | Definition | Notes |
| A | Battery | Battery positive connection |
| B | Battery | Battery positive connection |
| B+ | Battery | Battery positive connection |
| C | Center | Centre point of a Y stator |
| COM | Conputer | Computer Connection |
| D+ | Warning light | Comes from the old ‘Dynamo Positive’ on a generator |
| DFM | Dynamo Field Modulation | Duty Cycle signal from the ECU |
| E | Warning light | Comes from the word ‘Excitation’ |
| F | Field | For externally regulated alternators |
| FR | Field Regulation | Voltage Signal from the ECU |
| G | Ground | Chassis negative connection |
| I | Inidcator | Warning Lamp |
| L | Lamp | Warning Lamp |
| M | Field | Found on older Externally Regulated units |
| N | Neutral | Centre point of a Y-connected stator |
| P | Pulse | Stator connection for tachometer |
| R | Relay | Output to charge relays, etc |
| S | Sense | Battery Voltage sense wire |
| S (FORD) | Stator | Stator Pulse. Used for tachometers |
| T | Tach | Stator Pulse. Used for tachometers |
| W | Waveform | Stator Pulse. Used for tachometers |
2 Comments
js
Date
9/28/2020
Love it. thanks
Hammer
Date
1/17/2022
Good itechnical information
Peter Kennedy has been in business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and do-it-yourself boat owners who wish to undertake this work themselves.
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