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          Bosch F04R320370 - Voltage Regulator

          MPN: F04R320370
          The Bosch F04R320370 Voltage Regulator ensures stable voltage output in your Mercedes-Benz, protecting the electrical system from fluctuations. Easy to install and reliable.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $48.95
          In stock

          Product Overview

          The Bosch Voltage Regulator part number F04R320370 is an essential replacement component for your Mercedes-Benz, engineered to meet or exceed OEM standards. This premium-grade voltage regulator ensures optimal performance of your vehicle's electrical system, providing stable voltage output under various conditions. With Bosch's reputation for reliability and durability, you can trust that this part will perform effectively, keeping your vehicle running smoothly. Choose Bosch F04R320370 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Bosch F04R320370 is equivalent to or replaces the following part numbers: 0021545806

          Vehicle Compatibility

          • Mercedes-Benz 240D 2.4L4 Diesel (1981–1985)
          • Mercedes-Benz 280CE 2.8L6 Gas (1980–1981)
          • Mercedes-Benz 280E 2.8L6 Gas (1980–1981)
          • Mercedes-Benz 300CD 3.0L5 Diesel (1981–1985)
          • Mercedes-Benz 300D 3.0L5 Diesel (1981–1985)
          • Mercedes-Benz 300SD 3.0L5 Diesel (1981–1985)
          • Mercedes-Benz 300TD 3.0L5 Diesel (1981–1985)
          • Mercedes-Benz 450SEL 4.5V8 Gas (1980–1981)
          • Mercedes-Benz 450SL 4.5V8 Gas (1980–1981)
          • Mercedes-Benz 450SLC 4.5V8 Gas (1980–1981)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Bosch F04R320370 Voltage Regulator do?

          The Bosch Voltage Regulator regulates the voltage output in your vehicle's electrical system, ensuring stable performance and protecting sensitive components from voltage fluctuations.

          How do I know if my Voltage Regulator needs replacement?

          Common signs include dimming lights, electrical system malfunctions, battery warning lights, and issues with starting the vehicle. If you experience any of these symptoms, consider inspecting the voltage regulator.

          Can I install the Bosch F04R320370 myself?

          Yes, the Bosch F04R320370 can be installed by DIY enthusiasts. Ensure to follow proper safety procedures and consult your vehicle’s service manual for guidance.

          What are the symptoms of a faulty Voltage Regulator?

          Symptoms of a faulty voltage regulator include fluctuating electrical system performance, dimming dashboard lights, and intermittent starting issues. If you experience these problems, it might be time to replace your voltage regulator.

          Why should I choose Bosch for my Voltage Regulator needs?

          Choosing Bosch means you are investing in a product with a proven track record of quality and reliability. Order Bosch F04R320370 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              4255550
            • Weight
              0.13 lbs
            • Manufacturer Part #
              F04R320370
          • Brand
            Bosch
          • Manufacturer
            Bosch
          • MPN
            F04R320370
          • Part Type
            Voltage Regulator
          • Cross Reference Numbers
            0021545806
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          1978Mercedes-Benz450SLBase (4.5 V8 GAS)
          1978Mercedes-Benz450SELBase (4.5 V8 GAS)
          1978Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1978Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1978Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1978Mercedes-Benz280SEBase (2.8 L6 GAS)Notes: thru engine # 075271
          1978Mercedes-Benz280EBase (2.8 L6 GAS)Notes: thru engine # 076808
          1978Mercedes-Benz280CEBase (2.8 L6 GAS)Notes: thru engine # 076808
          1978Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1978Mercedes-Benz230Base (2.3 L4 GAS)
          1978Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1980Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1980Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1980Mercedes-Benz450SELBase (4.5 V8 GAS)
          1980Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1980Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1980Mercedes-Benz280SEBase (2.8 L6 GAS)Notes: thru engine # 075271
          1980Mercedes-Benz280EBase (2.8 L6 GAS)Notes: thru engine # 076808
          1980Mercedes-Benz280CEBase (2.8 L6 GAS)Notes: thru engine # 076808
          1980Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1980Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1980Mercedes-Benz450SLBase (4.5 V8 GAS)
          1981Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1981Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1981Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1981Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1981Mercedes-Benz280EBase (2.8 L6 GAS)Notes: thru engine # 076808
          1981Mercedes-Benz280CEBase (2.8 L6 GAS)Notes: thru engine # 076808
          1981Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1982Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1982Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1982Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1982Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1982Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1983Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1983Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1983Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1983Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1983Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1984Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1984Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1984Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1984Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1985Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1985Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1985Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1985Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1979Mercedes-Benz300TDBase (3.0 L5 DIESEL)
          1979Mercedes-Benz450SELBase (4.5 V8 GAS)
          1979Mercedes-Benz300SDBase (3.0 L5 DIESEL)
          1979Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1979Mercedes-Benz300CDBase (3.0 L5 DIESEL)
          1979Mercedes-Benz280SEBase (2.8 L6 GAS)Notes: thru engine # 075271
          1979Mercedes-Benz280EBase (2.8 L6 GAS)Notes: thru engine # 076808
          1979Mercedes-Benz280CEBase (2.8 L6 GAS)Notes: thru engine # 076808
          1979Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1979Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1979Mercedes-Benz450SLBase (4.5 V8 GAS)
          1975Mercedes-Benz450SEBase (4.5 V8 GAS)Notes: from engine # 029567
          1975Mercedes-Benz450SELBase (4.5 V8 GAS)Notes: from engine # 029567
          1975Mercedes-Benz450SLBase (4.5 V8 GAS)Notes: from engine # 030109
          1975Mercedes-Benz230Base (2.3 L4 GAS)Notes: from chassis # 033476
          1975Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1975Mercedes-Benz280SBase (2.8 L6 GAS)
          1975Mercedes-Benz280CBase (2.8 L6 GAS)
          1975Mercedes-Benz240DBase (2.4 L4 DIESEL)Notes: from chassis # 056706
          1975Mercedes-Benz280Base (2.8 L6 GAS)
          1975Mercedes-Benz450SLCBase (4.5 V8 GAS)Notes: from engine # 030109
          1976Mercedes-Benz450SEBase (4.5 V8 GAS)
          1976Mercedes-Benz450SELBase (4.5 V8 GAS)
          1976Mercedes-Benz450SLBase (4.5 V8 GAS)
          1976Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1976Mercedes-Benz280SBase (2.8 L6 GAS)
          1976Mercedes-Benz280CBase (2.8 L6 GAS)
          1976Mercedes-Benz240DBase (2.4 L4 DIESEL)Notes: from chassis # 056706
          1976Mercedes-Benz280Base (2.8 L6 GAS)
          1976Mercedes-Benz230Base (2.3 L4 GAS)Notes: from chassis # 033476
          1976Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1977Mercedes-Benz450SELBase (4.5 V8 GAS)
          1977Mercedes-Benz450SLBase (4.5 V8 GAS)
          1977Mercedes-Benz300DBase (3.0 L5 DIESEL)
          1977Mercedes-Benz280SEBase (2.8 L6 GAS)Notes: thru engine # 075271
          1977Mercedes-Benz280EBase (2.8 L6 GAS)Notes: thru engine # 076808
          1977Mercedes-Benz240DBase (2.4 L4 DIESEL)
          1977Mercedes-Benz230Base (2.3 L4 GAS)
          1977Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1974Mercedes-Benz230Base (2.3 L4 GAS)Notes: from chassis # 033476
          1974Mercedes-Benz240DBase (2.4 L4 DIESEL)Notes: from chassis # 056706
          1974Mercedes-Benz280Base (2.8 L6 GAS)
          1974Mercedes-Benz280CBase (2.8 L6 GAS)
          1974Mercedes-Benz450SEBase (4.5 V8 GAS)Notes: from engine # 029567
          1974Mercedes-Benz450SELBase (4.5 V8 GAS)Notes: from engine # 029567
          1974Mercedes-Benz450SLBase (4.5 V8 GAS)Notes: from engine # 030109
          1974Mercedes-Benz450SLCBase (4.5 V8 GAS)
          1973Mercedes-Benz280Base (2.8 L6 GAS)
          1973Mercedes-Benz280CBase (2.8 L6 GAS)
          1973Mercedes-Benz450SEBase (4.5 V8 GAS)Notes: from engine # 029567
          1973Mercedes-Benz450SELBase (4.5 V8 GAS)Notes: from engine # 029567
          1973Mercedes-Benz450SLBase (4.5 V8 GAS)Notes: from engine # 030109
          1973Mercedes-Benz450SLCBase (4.5 V8 GAS)Notes: from engine # 030109
          There are more vehicles this part is compatible with. Check if it fits your vehicle.
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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