Voltage Regulators

To prevent damage to the battery and the rest of the electrical system that would be caused by excessive alternator voltage output, the charging system incorporates a voltage regulator to maintain alternator output within a predetermined range, typically between 13.5 and 14.5 volts. The regulator controls alternator output by sensing the battery voltage and system demand and then varying the field current to the alternator rotor accordingly.

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    • (1 review)
      # sp10800
      Professional™ Voltage Regulator by ACDelco®. Get the proper voltage to your vehicle’s critical systems with ACDelco Professional Voltage Regulators. Built as the ideal replacement part for your worn Original Equipment, ACDelco...
      Delivers needed system voltage and provides the proper fit, form and function to let your vehicle run the way it was designedDesigned to deliver trouble-free, consistent performance
      $14.91 - $617.10
    • (0 reviews)
      # sp135523
      Voltage Regulator by Genuine®. If your starting and charging system parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store....
      Designed to restore your vehicle’s starting and charging systemGenuine OE replacement parts from the OE manufacturer
      $54.48 - $163.35
    • (0 reviews)
      # sp10750
      GM Original Equipment™ Voltage Regulator by ACDelco®. Get the proper voltage to your vehicle’s critical systems with ACDelco GM OE Voltage Regulators. Built as the ideal replacement part for your worn GM equipment, ACDelco GM OE...
      Outstanding radio noise control for better performance.Delivers needed system voltage and provides the proper fit, form and function to let your vehicle run the way it was designed.
      $15.77 - $90.95
    • (0 reviews)
      # mpn4516948118
      Voltage Regulator by Motorcraft®. Motorcraft is the way to restore the performance of your vehicle. Designed specifically for your vehicle, Motorcraft products meet stringent Ford Motor Company standards and feature OEM quality without...
      Direct OEM replacementMeets strict Ford Motor Company standards
      $35.01
    • (1 review)
      # sp13038
      Voltage Regulator by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to all channels...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $16.46 - $236.74
    • (0 reviews)
      # sp117297
      Voltage Regulator by Beru®. Designed utilizing the latest technology, this product by Beru features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to help bring your vehicle back in its tip-top conditionFaithful reproduction of the original part in quality, look, and function
      $32.76 - $58.13
    • (0 reviews)
      # sp21168
      Voltage Regulator by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!
      Developed to improve your driving experienceConstructed to ensure ultimate operation
      $11.74 - $90.24
    • (0 reviews)
      # sp126478
      Voltage Regulator by Hella®. Designed utilizing the latest technology, this product by Hella features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to help bring your vehicle back in its tip-top conditionFaithful reproduction of the original part in quality, look, and function
      $58.18
    • (0 reviews)
      # sp130038
      Voltage Regulator by Huco®. Designed utilizing the latest technology, this product by Huco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $24.08 - $95.37
    • (0 reviews)
      # sp124444
      Voltage Regulator by Kaehler®. Designed utilizing the latest technology, this product by Kaehler features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...
      Made in compliance with ISO 9001 standardsLeading innovations guarantee great service life
      $26.50 - $29.25
    • (0 reviews)
      # sp136292
      Voltage Regulator by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $47.58
    • (0 reviews)
      # sp19399
      Voltage Regulator by Omix-ADA®. Direct Fit. The alternator is a key component of the vehicle's charging system. It's driven by the crankshaft via a drive belt, recharging the battery once the vehicle is started and powering the vehicle...
      Performs according to OEM specificationsMeets or exceeds OEM quality standards
      $9.55 - $490.63
    • (0 reviews)
      # sp124445
      Voltage Regulator by Original Equipment®. Designed utilizing the latest technology, this product by Original Equipment features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $53.89 - $85.59
    • (0 reviews)
      # mpn4476300455
      Voltage Regulator by Tuff Stuff Performance®. Designed utilizing the latest technology, this product by Tuff Stuff Performance features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $14.47
    • (0 reviews)
      # mpn4476302363
      Voltage Regulator by Tuff Stuff Performance®. Designed utilizing the latest technology, this product by Tuff Stuff Performance features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $8.05
    • (0 reviews)
      # mpn4476300458
      Voltage Regulator by Tuff Stuff Performance®. Designed utilizing the latest technology, this product by Tuff Stuff Performance features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $16.76
    • (0 reviews)
      # mpn4476302250
      Voltage Regulator by Tuff Stuff Performance®. Designed utilizing the latest technology, this product by Tuff Stuff Performance features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $10.40
    • (0 reviews)
      # sp14104
      Voltage Regulator by OPGI®. This superior product is painstakingly designed to provide outstanding quality and value. Expertly crafted from first-rate materials to the highest standards it ensures maximum durability. This OPGI product...
      Made from first-rate materialsDesigned to comply with high-quality standards
      $88.52 - $164.84
    • (0 reviews)
      # sp21169
      Voltage Regulator by Vemo®. Designed utilizing the latest technology, this product by Vemo features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      OE quality fluids from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $16.82
    • (0 reviews)
      # sp144080
      Voltage Regulator by Lectric Limited®. Made in U.S.A.! Tech Notes: A voltage regulator is the device that regulates the output of a generator or alternator to maintain a constant voltage level. Lectric Limited® quality voltage...
      Developed with modern technology and innovationMeticulously Tested for the ultimate in quality
      $60.30 - $78.30
    • (0 reviews)
      # sp93953
      Professional™ Alternator Brush Set by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $1.82 - $17.44
    • (0 reviews)
      # sp126475
      Alternator Brush Set by Bosch®. Do you hear nothing but "click, click" when you turn the key? Is the BATTERY dash light on? Your vehicle is in need of engine electrical system repair, but before you waste your time and gas running out...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $5.41
    • (0 reviews)
      # sp20401
      Alternator Brush Holder by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to all...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $5.13 - $18.01
    • (0 reviews)
      # sp20402
      Alternator Brush Set by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to all...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $1.51 - $69.42
    • (0 reviews)
      # sp20415
      Intermotor™ Alternator Brush Holder by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $10.47 - $37.54
    • (0 reviews)
      # sp20418
      Intermotor™ Alternator Brush Set by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $2.12 - $17.64
    • (0 reviews)
      # sp16888
      Alternator Brush Assembly by Genuine®. If your starting and charging system parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...
      Designed to restore your vehicle’s starting and charging systemGenuine OE replacement parts from the OE manufacturer
      $26.36 - $41.06
    • (0 reviews)
      # sp16889
      Alternator Brush Set by Genuine®. If your starting and charging system parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...
      Designed to restore your vehicle’s starting and charging systemGenuine OE replacement parts from the OE manufacturer
      $13.87 - $19.72
    • (0 reviews)
      # sp144078
      Transistor Voltage Regulator Box Extension by Lectric Limited®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....
      Developed with modern technology and innovationMeticulously Tested for the ultimate in quality
      $170.10
    • (0 reviews)
      # sp144079
      Transistor Voltage Regulator Box Harness by Lectric Limited®. Voltage regulator to Engine Harness. Voltage regulator to Engine Harness. This top-grade product is expertly made in compliance with stringent industry standards to offer a...
      Developed with modern technology and innovationMeticulously Tested for the ultimate in quality
      $90.90




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    When voltage falls below the regulator setting, such as would occur when the battery needs charging and the lights are turned on, the field current is increased, which strengthens the magnetic field and increases the charging voltage output. If the battery is fully charged and no accessories are on, and voltage exceeds the maximum setting, the regulator will decrease field current, which weakens the magnetic field and decreases voltage output.

    Older vehicles used a mechanical, externally mounted voltage regulator. These used coils and contact points to regulate power to the alternator rotor, but the points eventually suffered from pitting and sticking, which could result in overcharging. Mechanical voltage regulators were replaced by electronic, solid state, voltage regulators that use transistors. Where mechanical voltage regulators generally switch on and off about 200 times per second, solid state regulators can do so approximately 7,000 times per second. Solid state regulators are available as an upgrade for many original mechanical regulator applications.

    On many vehicles, external regulators were eventually supplanted by internal regulators that are integral with the alternator, which saved space and simplified wiring. Today voltage regulator function is handled by the Powertrain Control Module (PCM) on most vehicles. In addition to battery voltage and electrical demand, factors including battery temperature, ambient temperature, engine load, and other inputs are commonly used by the PCM to calculate charging system output. But if your vehicle is equipped with a traditional voltage regulator, no matter where it’s mounted, we can supply you with a quality replacement.

    If you’re restoring a classic car, where appearance is just as important as functionality, we can supply you with an original equipment voltage regulator that has the right look for your engine compartment and will properly regulate voltage to protect your electrical system. If your vehicle is equipped with a solid state regulator or you want to upgrade to their superior reliability, we have the electronic regulators for all popular applications. We even offer integral voltage regulators for select applications, so you don’t have to replace the entire alternator because of a failed regulator.

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    Voltage Regulators Reviews

    Average rating:  4.5  4.5 - 3 reviews
    3.3 of 5
    Great Hard To Find Product
    All my gauges on my 40 yr old Dodge Van work again thanks to this great part.
    Posted by Jimi Hughes (Bronx, NY) / October 24, 2017
    Was this review helpful for you? Yes
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