D+ Terminal on Alternator

Hello!

For what purpose is the D+ terminal actually needed on the alternator? Actually, B+ and B- should be sufficient, the rest is handled by the controller.

Best regards

blackblizzard wrote:

Actually, B+ and B- should be sufficient, the rest is taken care of by the controller.

I don't think so.

What is D+?
D+ (Dynamo Plus) = Excitation coil/Charging control light, also Class 61

And how does this work with the excitation coil? I have always thought that the controller "manages" this.

blackblizzard wrote:

And how does this exciter coil work? I have always thought that the controller {controls}

Yes, he does. However, he needs to know that he should be aiming for something. And that's what he says, how it should be, D+.

And how should that work, or how and where is the D+ connected?

Best regards

Please follow the link in this thread:
/viewtopic.php?t=22582&highlight=120a

Thank you!

So, man könnte also D+ eigentlich an B+ hängen, dann würde die Lima genau so funktionieren, nur die Ladekontrolleuchte wäre dann ohne Funktion??

Best regards

Your alternator does not have a permanent magnet installed. Therefore, the exciter coil needs a voltage. Without the excitation coil, no electrical energy is generated.
With the bridge, it only works if there is still some residual magnetism in the excitation coil.

I already know that the exciter coil is not a permanent magnet. That's why I'm asking: What if I simply connect the D+ terminal of the alternator to the B+ terminal? Then, current flows through the field coil, and the alternator must also supply power.

Tell me, what your problem is.

What came first, the egg or the chicken?
As long as there is no magnetic field, there will be no voltage. Therefore, there will be no voltage for the motor. And therefore, the alternator will not work with the bridge.

I'm only interested in the function of the alternator - specifically, the D+ Kemme.

D+ Depends on the ignition being on, meaning that when the ignition is on, current flows to the excitation coil.

The same effect would also occur if D+ and B+ were connected - however, with a stationary vehicle, the battery would eventually drain.

Is that correct?

Good question...I know exactly what you mean. Yes, the child has only a different name for the purpose of identification.
D+ is connected to the KL.30 (B+). D+ is used solely to identify the wire that supplies the excitation voltage to the alternator.

In principle, Kl.85 on a relay (the copper coil) is simply switched B+ or Kl.15... this is only for easier identification... because everything in a car is B+ or B-, but simply wired differently.

blackblizzard wrote:

My focus is solely on the function of the alternator - specifically on the D+ terminal. D+ Depends on the ignition being on, meaning that when the ignition is on, current flows to the excitation coil. The same effect would also occur if D+ and B+ were connected - however, with a stationary vehicle, the battery would eventually drain. Is that correct?

must measure whether there is voltage at B+ when the car is stationary.
yes, if that's the case, then the battery will drain...

Thank you, now it's clear