Figure 6: Basic block diagram of an alternator voltage regulator

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How To Repair an Alternator Voltage Regulator - YouTube

Voltage Regulator for Ford 3G Alternator w/ Brush Holder (Heavy Duty)

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  • This information is useful for someone who may take it upon himself or herself to open up an alternator and replace the defective internal part. Almost all alternators used in today's vehicles have internal voltage regulators. Thus when replacing the alternator the voltage regulator no longer must be purchased separately. Because the voltage regulators have no moving parts and are electronically controlled, the only wear related item found in an alternator would be the brushes. More often than not, the alternator brushes are part of the voltage regulator, so in order to replace the brushes, the voltage regulator must be replaced.

    Find the multi-wired harness nearby the alternator and voltage regulator. On the end of the harness is a plastic rectangular plug that has four colored wires attached. The brown wire goes to the ignition, the blue is the field wire and goes to the alternator, the red wire is the positive battery sensor and the white wire goes to alternator stator.

  • I have a 1974 vw beetle and need to know how to troubleshoot the ALTERNATOR and VOLTAGE REGULATOR to determine which one is the bad component that is preventing the charging system from working. With12.7 volts on the battery then start the engine the voltage starts going down instead of registering 13 to 14 volts as it should. How do I find the guilty party????????

    Oddly enough, temperature-compensation curves vary from car manufacturer to car manufacturer even though the battery technology does not change from car to car. Flexibility is one of the advantages of making a complex alternator voltage regulator, right?

    Product Compliance Status Description Number of Drivers VCC Max (V) V(BR)GSS Max (V) V(BR)DSS Max (V) ID Max (A) rDS(on) Max (Ω) Tj Max (°C) Package Type
    Halide free
     Active     Alternator Voltage Regulator Darlington Driver 

  • Datasheet: Alternator Voltage Regulator Darlington Driver
    Rev. 12 (78.0kB)

    Let’s go into a design of a simple microcontrolled system in detail. Figure 6 shows a basic block diagram for a microcontroller-based alternator voltage regulator. Since the fixed-frequency system is much more stable and easier to work with, we’ll focus on this approach.

420A/Neon Alternator Voltage Regulator

An alternator, such as the one shown in Figure 1, is a current-mode machine. You put a current in and, with some help from a mechanical input (a pulley), you get a gained current out. But, you say, isn’t this an alternator voltage regulator? Yes, and this is where the problems begin. To control the output of a current-mode machine by looking at its voltage, knowing that the loads can vary in type (or phase) and amplitude at any time, is quite a challenge.