MARCH PERFORMANCE P2556-04 Gm Alternator Finish Steel Belt Pulley 10SI 140-AMP Cast Fan Wire 140CAST

( Brand: March Performance ), ( Manufacturer Part Number: P2556-04 ), ( Color: As-cast ), ( Vintage Part: No ), ( Type: Alternator ), ( Manufacturer Warranty: Lifetime ), ( Voltage: 12 V ), ( Amperage: 140 A ), ( Features: Clockwise Rotation, One Wire Capable ), ( Universal Fitment: Yes ), ( Finish: Unfinished ), ( Country Of Origin: China )

Review MARCH PERFORMANCE Gm Alternator 140cast Finish Steel V belt Black Pulley And Fan Wire

The Performance P2556-04 GM 10SI alternator is a high-performing component designed specifically for vehicles requiring a 140-amp alternator. This alternator comes with a cast finish steel V-belt pulley fan, adding to its robust and durable construction.

The alternator housing is made from a robust 140 cast material, providing superior strength and resistance to wear and tear. The V-belt pulley fan, also cast from steel, offers excellent heat dissipation capabilities, ensuring optimal performance even during heavy usage.

The Performance P2556-04 alternator is compatible with select GM 10SI engines and is a direct replacement for the original equipment. With a capacity of 140 amps, it provides enough power to keep your vehicle's electrical systems functioning at their best.

The alternator comes with wire connections for easy installation. The wiring is not included in the package, so it's essential to ensure you have the appropriate wiring harness for your specific application before proceeding with the installation.

The Performance P2556-04 GM 10SI alternator is a reliable and efficient solution for maintaining the electrical power requirements of your vehicle. Its cast finish steel construction offers superior durability, while the V-belt pulley fan ensures optimal cooling for consistent performance. With its compatibility with select GM 10SI engines and 140-amp capacity, this alternator is an excellent choice for those seeking a high-quality and dependable replacement part.

Buying a performance alternator, such as the P2556-04 GM 10SI alternator with a 140 cast finish steel V-belt pulley, fan, and wire harness, can have several pros and cons for vehicle owners. Here are some potential advantages and disadvantages to consider before making a purchase:

1. Increased charging capacity: A high-performance alternator like this one can provide more amperage to keep up with the demands of modern vehicles, especially those with multiple electrical systems or high-performance accessories.

2. Durability: Cast alternators are known for their robustness and longevity, making them a good investment for those who want to avoid frequent replacements.

3. Improved battery charging: A more powerful alternator can help keep the battery charged, reducing the risk of dead batteries and extending the life of the battery.

4. Enhanced reliability: High-quality alternators are less likely to fail, providing peace of mind for vehicle owners who want to ensure their vehicle's electrical systems are functioning optimally.

5. Smoother engine operation: A well-functioning alternator is essential for maintaining a stable voltage output, which can contribute to smoother engine operation and improved fuel efficiency.

1. Cost: Performance alternators can be more expensive than standard alternators, making them a significant investment for some vehicle owners.

2. Installation complexity: Installing a high-performance alternator may require specialized tools and knowledge, and the process can be more time-consuming than a standard alternator replacement.

3. Compatibility: Ensure that the alternator is compatible with your specific vehicle make, model, and year before purchasing to avoid potential issues.

4. Weight: Cast alternators are heavier than their aluminum counterparts, which could impact fuel economy and handling, although the difference is usually negligible.

In conclusion, the decision to buy a performance alternator like the P2556-04 GM 10SI alternator depends on your specific needs, budget, and vehicle requirements. If you frequently use high-power electrical accessories or want to ensure the longevity of your electrical systems, a high-performance alternator may be a worthwhile investment. However, if you prioritize cost and ease of installation, a standard alternator may be a more suitable choice. Always consult with a professional mechanic or automotive expert for personalized advice before making a purchase.

Recommendation: Consider the benefits and drawbacks of a high-performance alternator carefully and weigh them against your personal needs and budget. If you decide to proceed with the purchase, ensure that you obtain a reputable brand and consult with a professional mechanic for installation to maximize the benefits and minimize potential issues.

Details:

Built with neoprene-sealed bearings, high-efficiency copper and steel internals, a standard cast finish, it combines Performance, durability, precision craftsmanship. This 140-amp, one-wire alternator provides strong, consistent charging with ultra-low cut-in voltage regulators for maximum output even at idle. Ultra Series GM 10SI Alternator.

part #: p255604 prices

• $174.99-$348.99

specifications altnagen:

• brand: March Performance
• mpn: P2556-04
• color: As-cast
• vintage part: No
• type: Alternator
• manufacturer warranty: Lifetime
• voltage: 12 V
• amperage: 140 A
• features: Clockwise Rotation, One Wire Capable
• universal fitment: Yes
• finish: Unfinished
• country of origin: China

payments altnagen:

• wallet: Apple-pay
• credit card: Discover
• other

shipping altnagen:

• class: Standard
• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 3-8 Days
• cost: $0.00

offer altnagen:

• options: Ship-to-home
• availability: In Stock
• started: March 11, 2026
• sold: 0
• quantity: 5

seller altnagen:

• city: New Prague, Minnesota
• # reviews: 352
• rating: 96.7%

general altnagen:

• condition: New
• Car Truck Parts Accessories > Starters, Alternators, ECUs Wiring > Alternators Generators

returns altnagen:

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

March Performance P2556-04 Is Similar To:

• 9665 March Performance 140 Amp 191215085989 (36.2% similar) It will need to be sent via common carrier. Priced each. Aluminum case. Clear powder coat. If an item has any component with a shipping weight over 150 lbs...(September 2nd, 2017)
• 1-wire 9650 March Performance 140 Amp Gm Clear Powder Coat Alternator P N Mpp9650 (40.6% similar) Shipping shipping charge covers the 48 continental USA only. Picture is generic...(December 6th, 2016)
• P595 March Performance Alternator Amps Polished Chrysler Square Back Case (53.6% similar) Buyer pays return shipping. Advertised amperage output 100 amps alternator brackets included no case Chrysler square back finish polished belt one-wire capable yes pulley serpentine quantity sold individually. Fitment information may not be available for all products and those without will have a ...(June 18th, 2018)
• March Performance P572 Gm Cs130 Alternator 105a 12v (54.1% similar) Quantity: each. Internal/external regulator: internal. Case material: aluminum. voltage : 12V. Case color: chrome. Current: 105A. Rating: 140. Case finish: plated. Finish: chrome. Case style: CS130. It is an ideal solution for your vehicle, delivering years of safe, trouble-free operation, so you ...(January 9th, 2025)
• March Performance P590 1-wire Alternator (47.9% similar) American express...(August 24th, 2025)
• March Performance P2525-06 Gm Cs130 Alternator 140 Amp Chrome Left Offset 1 Wire 6 Rib Serpentine And Fan (62.6% similar) Built with neoprene-sealed bearings for long life and a brilliant chrome finish, its as durable it is eye-catching. Ultra series gm CS130 alternator. This high-output 140-AMP, one-wire alternator offers easy installation and delivers powerful, consistent Performance thanks to ultra-low cut-in ...(March 11th, 2026)