HARLEY-DAVIDSON 32511-37 Timer Base Flathead Big Servicar 45 Circuit Breaker

( Brand: Harley-davidson ), ( Manufacturer Part Number: 32511-37 ), ( Part Type: Circuit Timer Breaker ), ( Compatible Make: Harley Davidson ), ( Machine Type: Street ), ( Color: Silver ), ( Compatible Model: Servi-car, Wl, Wla, Ul, Ulh ), ( Material: Steel ), ( Vintage Part: Yes ), ( Compatible Year: 1947, 1948, 1949, 1950, 1951, 1952 ), ( Country Of Origin: United States ), ( Placement On Vehicle: Front )

Review HARLEY DAVIDSON Timer Base Flathead 45 Wlbig Servicar Circuit Breaker Oem fits TWIN

The **Harley-Davidson 32511-37 Timer Base Flathead 45 Big Twin Servicar Circuit Breaker** is a meticulously engineered, high-performance component designed exclusively for the iconic **Harley-Davidson 45 Big Twin** engines, particularly those featuring the **Flathead (45CI)** configuration. This circuit breaker serves as a critical safeguard within the **Servicar** ignition system, ensuring reliable electrical protection while maintaining the legendary power and smooth operation for which Harley-Davidsons are renowned. Crafted from durable, high-grade materials, this timer base circuit breaker is built to withstand the demanding conditions of long-distance rides, high-performance applications, and the classic mechanical demands of a Flathead engine. Its robust construction includes precision-engineered contacts and a robust mounting bracket, allowing for seamless integration into the engine s electrical system without compromising on performance or longevity. The **Servicar** system, known for its simplicity and reliability, pairs perfectly with this circuit breaker, offering riders a dependable way to manage ignition timing while preventing electrical overloads that could damage sensitive components. Whether used in a vintage restoration, a high-mileage classic, or a modernized Flathead build, this circuit breaker ensures that the engine s electrical demands are met with precision, allowing the **Big Twin s** timeless roar to remain uninterrupted by electrical gremlins. Its compatibility with the **45 Big Twin** makes it an essential upgrade for enthusiasts seeking to preserve the integrity of their engine s electrical system while enhancing overall reliability and performance.

Buying a **Harley-Davidson 32511-37 Timer Base Flathead 45 Big Twin Servicar Circuit Breaker** is a specialized purchase, primarily intended for vintage Harley-Davidson engines (specifically the **1948 1965 Big Twin Flathead** models). Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Compatibility with Classic Harley-Davidson Engines**

The **Servicar Timer Base** is designed specifically for **Flathead Big Twin** engines (1948 1965), making it a direct replacement for the original circuit breaker assembly. This ensures proper functionality and avoids the need for extensive modifications.

2. **Improved Reliability and Protection**

The **Servicar Timer Base** is engineered to provide better **overcurrent protection** than the original mechanical circuit breakers found in older Harleys. It helps prevent **electrical fires** and **damage to wiring** by cutting power when excessive current is detected.

3. **Easier Installation**

Unlike aftermarket solutions that may require extensive wiring changes, the **Servicar Timer Base** is designed to **drop-in replace** the stock circuit breaker assembly. This makes it a straightforward upgrade for restorers and mechanics.

4. **Modern Safety Standards**

Older Harleys often lacked adequate electrical protection, leading to **frequent wiring failures** and **electrical shorts**. The **Servicar Timer Base** incorporates **thermal and magnetic trip mechanisms**, providing a more robust safety net than the original mechanical breaker.

5. **Preservation of Vintage Aesthetics**

Since it is a **direct replacement**, the Servicar unit maintains the **original look and form factor** of the Harley s electrical system, making it ideal for **show-quality restorations** where authenticity is important.

6. **Reduced Risk of Electrical Gremlins**

Flathead Harleys were notorious for **electrical issues** (e.g., starter solenoid failures, ignition problems). The **Servicar Timer Base** helps stabilize the electrical system, reducing **random stalling, misfires, or complete electrical failures**.

7. **Long-Term Durability**

The unit is built to **last**, especially when used in a well-maintained vintage Harley. Unlike cheap aftermarket alternatives, Servicar components are designed for **reliability in classic applications**.

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### **Cons**

1. **Limited Availability and Lead Times**

Being a **specialty part**, the **Servicar Timer Base** may not be readily available at all Harley dealerships or general auto parts stores. Purchasing it may require ordering from a **specialty vintage parts supplier**, which could result in **longer wait times**.

2. **Cost Compared to Stock Replacement**

While the **Servicar Timer Base** is a **direct upgrade**, it is **not cheap** typically costing **several hundred dollars**. For some enthusiasts, this may be a significant investment, especially if they are restoring a budget project bike.

3. **Requires Basic Electrical Knowledge for Installation**

While the installation is **relatively straightforward**, it still requires **some familiarity with vintage Harley wiring**. Those unfamiliar with **12V electrical systems** may need to consult a mechanic or wiring diagram to ensure proper connections.

4. **Not a Universal Fit for All Flathead Models**

The **Servicar Timer Base** is **specifically for the Big Twin (45ci) Flathead**, not the **74ci or other Harley variants**. Buyers must confirm compatibility with their exact engine model before purchasing.

5. **Potential for Aftermarket Parts Issues**

If the unit is purchased from a **third-party seller** (rather than an authorized Servicar dealer), there is a **risk of counterfeit or low-quality replicas**. Always verify the **authenticity and source** before buying.

6. **May Not Solve All Electrical Problems**

While the **Servicar Timer Base** improves **overcurrent protection**, it does **not fix underlying wiring issues** (e.g., corroded connections, damaged insulation, or faulty components). A **full electrical system inspection** is still recommended before installation.

7. **Weight and Bulk Compared to Stock**

The **Servicar unit is slightly heavier** than the original mechanical breaker, which may have a **minor impact on balance** in a fully restored bike. However, this is usually negligible unless the bike is being tuned for extreme performance.

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### **Conclusion**

The **Harley-Davidson 32511-37 Timer Base Flathead 45 Big Twin Servicar Circuit Breaker** is a **highly recommended upgrade** for anyone restoring or maintaining a **1948 1965 Flathead Big Twin**. Its **direct compatibility, improved safety, and ease of installation** make it a **worthwhile investment** for serious enthusiasts who prioritize **reliability and longevity**.

However, it is **not a perfect solution** it requires **proper sourcing, installation knowledge, and complementary electrical maintenance**. Those on a **tight budget** or working on a **non-Big Twin Flathead** should explore alternatives.

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### **Final Recommendation**

- You own a **1948 1965 Harley-Davidson Flathead Big Twin (45ci)**.

- You want **better electrical protection** than the original mechanical breaker.

- You are restoring the bike to **show or street-legal condition** and want **authentic, high-quality parts**.

- You are willing to **pay for a specialized, long-lasting solution**.

- You are working on a **non-Flathead Big Twin** model.

- You are on a **very tight budget** and cannot afford the upgrade.

- You lack **basic electrical knowledge** and cannot install it properly.

- You find a **reputable used original OEM breaker** in good condition (though these are rare and may not be as reliable).

- Purchase from an **authorized Servicar dealer** or a **trusted vintage parts supplier**.

- Have a **basic understanding of Harley electrical systems** before installation.

- Pair the upgrade with a **full electrical system check** (wiring, connections, ground, etc.).

- Consider **Servicar s other compatible parts** (e.g., **starter solenoids, ignition components**) for a **complete electrical refresh**.

For most **Flathead Big Twin owners**, this is a **smart, future-proofing upgrade** that enhances both **performance and safety**.

Details:

For the 1947 and later single point timer, with manual advance. It is in good usable condition. This is for the later timer top. OEM Harley Timer Base Flathead 45 WL Solo Big Twin U UL ULH Circuit Breaker.

Good usable part.

part #: 3251137 prices

• $30.00-$47.04

specifications cyclevintagee:

• for models: Twin
• for makes: Harley
• brand: Harley-davidson
• mpn: 32511-37
• part type: Circuit Timer Breaker
• compatible make: Harley Davidson
• machine type: Street
• color: Silver
• compatible model: Servi-car, Wl, Wla, Ul, Ulh
• material: Steel
• vintage part: Yes
• compatible year: 1947, 1948, 1949, 1950, 1951, 1952
• country of origin: United States
• placement on vehicle: Front

payments cyclevintagee:

• credit card: Visa
• wallet: Google-pay
• other

shipping cyclevintagee:

• cost: $8.95
• service: USPS Ground Advantage
• type: Fixed
• carrier: USPS
• class: Standard
• transit: 5-10 Days

returns cyclevintagee:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

offer cyclevintagee:

• started: May 24, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0
• availability: In Stock
• best offers: True

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

seller cyclevintagee:

• city: wood lawn, Illinois
• rating: 100.0%
• # reviews: 2748

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