Alternator Toyota voltage regulator

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The regulator voltage of the alternator is a circuit responsible for maintaining the voltage level generated by the alternator within the specified limits that are between 13V and 14.5V.

Alternator Toyota voltage regulator

Looking for sometime on the internet, I did not get quality information about how to test the voltage regulators in alternators and how their pins or terminals work.

What is an alternator voltage regulator?

It is a circuit responsible for maintaining the voltage level generated by the alternator within the specified limits that are between 13V and 14.5V. This is done by exerting / turning off the rotor field. In addition to this, it performs the diagnostic function of the system in such a way as to inform the user about the bad operation of the system by turning on a lamp.

Terminals of an toyota alternator voltage regulator

Here I bring you the case of Toyota.

regulador de voltaje toyota

Explaining the regulator pins:

E: Earth (negative)

Gives the negative power of the regulator circuit. Important to note that it is below ground input and has no communication with the heat sink.

P: Induction voltage also known as S-terminal "stator". (positive input signal)

This is the signal that comes from the alternator stator, once it starts generating the alternator, this induced voltage tells the regulator that the generator is already working and that it must start the monitoring process in addition to turning off the BAT light on the board.

F: Controlled field current output. (Negative output signal)

Controls the on and off of the rotor field. This exit is protected by C.C. and has an output modulator in ramp so that there are no voltage spikes induced product of connecting and disconnecting the field current.

B: Battery voltage. (Positive input signal)

Through this terminal the regulator measures the voltage of the system to exert control over the turning on and off of the rotor field.

L: Fault indicator lamp (Board battery light). (Negative output signal)

Indicates that there is a problem with the regulation system or if the alternator is not generating power.

IG: Power on the system. (Positive input signal)

Turn on the regulator and all its associated components. It is important to add that the (L) LAMP signal is always active so there is no IGN voltage, but in this case, it will be a poor ignition.

¿How Work?

Actually this module is not a regulator as such, that is, it does not work like a normal voltage regulator which keeps the output voltage stable under any regime of load consumption, rather it is like a brake or a generated voltage limiter.

To test the voltage regulator in this case of Toyota, just mount the following circuit:

diagrama para probar regulador de voltaje

By energizing the circuit, with the Ign suiches. And Generates. off we will have a dim light in the BAT lamp.

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When we set ON to the suiche Ign. It will strongly light the BAT light and will light the Coal lamp very little. Turn it on a little because it is your put that we are going to start the engine and we need that all the power of the battery goes to the starter motor.

When starting the motor, with the weak field current the stator starts generating energy by polarizing the terminal P of the regulator (or S of stator for other marks), in this way the regulator turns off the battery lamp and puts at full current the rotor field. The Charcoal lamp will light intensely.

This remains stable only until the voltage measured by the B + terminal exceeds 14.5V, at which point the regulator opens the F terminal, thereby turning off the field. (Carbon lamp goes off).

When the voltage measured by the B + terminal drops below 14.5V, terminal F closes, connecting the alternator field.

Porque el Regulador de voltaje, no es un regulador de voltaje común.

As I commented a few paragraphs ago, this device does not work as a common regulator since the voltage is not stable in all the consumption regimes of the system, but it floats between 13V and 14.5V, even for discharged batteries it can arrive without problems up to 12.3V.

If we want an operational test to check the operation, we will mount the following one. (This is the one that I mounted in my YouTube video)

diagrama para probar regulador de voltaje operativo

In this case, to be able to notice if there is regulation of field current, a stable source is placed on the previous circuit that does not depend on the regulated voltage. This so that the luminosity is not affected when we lower or raise the tension in B +.

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Below the disarming video of an alternator and the regulator test with this circuit:

Video of how I did it

Voltage regulator problems

These are quite reliable elements today, more than all because the protection against short-circuit currents and even the temperature for the most modern.

The problems are converted beyond the dirt of the heat sink that deteriorates the internal power transistor.

A regulator in semi-closed mode causes regulation problems (genera more than 14.5V) and flashing lights.

A regulator in open mode the alternator will not generate power.

It is all at the moment,

Do you have questions or doubts?

Questions or suggestions can use the form below and I will gladly answer them.

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Written by

Dennis García
Chica Mecánica.
20/06/2019
.

Grade 
06/20/2019

Excelente

Gran post

    Grade 
    06/20/2019

    Excelente

    Gran post

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      Alternator Toyota voltage regulator

      Alternator Toyota voltage regulator

      The regulator voltage of the alternator is a circuit responsible for maintaining the voltage level generated by the alternator within the specified limits that are between 13V and 14.5V.

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      • Asked by David
        on 01/10/2020
        ¿Como identifico los cables que se conectan a los terminales F y L? Compre un Chevrolet Cavalier, no tenia el conector del regulador de voltaje, sólo dos cables sueltos uno ROJO y uno VERDE, por temor a conectarlos mal quisiera saber que color corresponde a cada terminal. Espero puedan ayudarme, Muchas gracias Answer:
        F es de campo, salida del regulador. Tendrias que probar el modulo como hago y luego medir continuidad...pero ojo debes tener conocimiento David, si lo conectas mal dañaras el regulador.
      • Asked by Juan A Ortiz
        on 01/27/2020
        Tengo un alternador de un Honda civic 96 4 cables pero le puse una pcm p2t a11 y está pcm no tiene la señal de salida para el alternador no se el votage o si es negativo que genera la pcm para el regulador de si voltaje positivo o si tengo que poner a tierra esa señal que me falta se active el regulador. Hay un cable negro y línea amarilla uno blanco y rojo otro blanco y azul y banco y verde creo que estos cuatro le voy agradecer su pronta ayuda. Gracias Answer:
        En el Honda Civic, 4 cables no tengo el diagrama del mismo Juan. No podría ayudarte con tu pregunta.
      • Asked by Yair
        on 02/15/2020
        Mi alternador de Toyota Me apaga el bombillo pero solo manda 13 v y no 14.5 ahí que puede ser gracias Answer:
        Es posible que tengas los carbones gastados, problemas con el cableado principal Yair.
      • Asked by Jonathan Calderón
        on 03/02/2020
        Gracias por compartirlo, me dedico a reparar alternadores y no tenía el conocimiento para hacer un probador de reguladores, siempre tengo que ir a la ventas de respuestos a qué me los prueben con una su maquinita especial que tienen y corro el riesgo que me digan que estén malos solo por venderme aunque en realidad estén buenos (ya me ha pasado muchas veces). Gracias a su ayuda ya puedo ingeniarmelas para probar otros reguladores del tipo Denso parecidos al del diagrama, por ejemplo el de honda que lleva 4 pines, o el de Volvo que lleva solo 1. Muchísimas gracias por compartir sus conocimientos Answer:
        Que bueno leer tu comentario Jonathan. Me contenta que te haya ayudado con mi articulo. Tambien está mi video, lo puedes ver como hago la prueba. Cualquier duda, me dices, y si no es mucho pedir te suscribes a mi canal. ; )
      • Asked by Alexander
        on 03/23/2020
        Hola qué tal tengo un Yaris con ese regulador y de pronto me comenzó una falla como de cilindro acelere algo fuerte y salió como polvo del alternador me prendió la luz en el tablero y solo apaga cuando lo aceleró duro y cuando baja la rpm vuelve a prender que podría ser Answer:
        Hola Alexander, el problema que tienes es que los carbones estan gastados. Es sencillo de reparar. Compras los carbones y reeemplazas.
      • Asked by Waly
        on 07/16/2020
        Hola Dennis como estas saludos desd Argentina, mi consulta seria como podria probar en forma general cualquier regulador de voltaje, se podria hacer algun circuito para hacer pruebas asi para cualquier regulador? Answer:
        Hola Waly. En general todos los reguladores trabajan de la misma forma. Entonces si es posible realizar un circuito que realice esta función.

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