DMGRS Posted September 3, 2023 Share Posted September 3, 2023 Greetings, individuals. I have recently examined an error code pertaining to an alternator. Error: Layer Generator Code: 4A07 After doing the necessary maintenance, I saw that the alternator is equipped with two wires, one designated for power transmission and the other specifically intended for Battery Management System (BMS) functionality. Is it expected for this connection to have two wires connected to the alternator, as I have noticed that mine only has one cable. However, the terminals on the connector are labeled as positive and negative. Quote Link to comment Share on other sites More sharing options...
stevenkeyte Posted September 3, 2023 Share Posted September 3, 2023 One could have assumed that the availability of BMW WDS (wiring diagrams) was widespread, however, it is now limited to unreliable Russian websites and requires the use of an outdated plug-in for functionality. Quote Link to comment Share on other sites More sharing options...
markjay Posted September 3, 2023 Share Posted September 3, 2023 I refrained from inundating you with inquiries, therefore initiating a fresh discussion thread pertaining to a distinct matter. Is it OK to have just one wire present in the connection block? Quote Link to comment Share on other sites More sharing options...
pharmoun Posted September 3, 2023 Share Posted September 3, 2023 Typically, these systems are equipped with two wires: one wire is responsible for energizing the field coils, while the other wire is connected to the dashboard light. Although I have seen instances when a single wire is used, I have not yet engaged in the diagnostic process for such a configuration. Quote Link to comment Share on other sites More sharing options...
markjay Posted September 3, 2023 Share Posted September 3, 2023 I appreciate the feedback provided. I have not encountered any issues either to battery charging or the illumination of dashboard lights. Is it advisable to disregard this code in your opinion? Quote Link to comment Share on other sites More sharing options...
markjay Posted September 3, 2023 Share Posted September 3, 2023 The connections connecting to and from the alternator were completely detached, followed by a meticulous cleaning using an appropriate cleaner. As a result, all fault codes associated with the alternator have been successfully eliminated. The outcome is evident. Quote Link to comment Share on other sites More sharing options...
pharmoun Posted September 3, 2023 Share Posted September 3, 2023 I am pleased that you have successfully identified the issue with the connection, which was previously experiencing difficulties. Quote Link to comment Share on other sites More sharing options...
markjay Posted September 3, 2023 Share Posted September 3, 2023 The aforementioned entities have returned. My impatience was the cause of the recurring error codes. I will oversee and revise as necessary. Quote Link to comment Share on other sites More sharing options...
vitessear3 Posted September 3, 2023 Share Posted September 3, 2023 Has a solution been identified for this issue? Encountering a similar predicament. I performed maintenance on the BMS connection, namely the single wire connector, and also tightened the screw on the positive terminal of the alternator. The observed symptoms are the initial voltage reading of 11.8-11.9 when starting the automobile, followed by a further increase in voltage to a range of 13.8-14.1 after turning the car off and on again. I proceeded to replace the battery with an original equipment manufacturer (OEM) battery that was readily available to me, and meticulously inspected all the connections inside the battery compartment. It should be noted that the issue of recurrence is not consistent, as the device operated without any problems for a duration of three days subsequent to the battery replacement, just to manifest the issue once again. Any assistance provided would be much appreciated. Thank you. Quote Link to comment Share on other sites More sharing options...
Starcar2022 Posted September 3, 2023 Share Posted September 3, 2023 The voltage regulator is an essential component of an alternator. Quote Link to comment Share on other sites More sharing options...
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