Replaces Delco-Remy 21Si & 22Si Type Alternators for Extreme Duty Use
150, 170, 200 and 250 AMPERAGE MAX OUTPUT DUAL RECTIFIER ALTERNATOR

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The Quick Start EXTREME DUTY DUAL RECTIFIER ALTERNATOR

Alternators produce AC current, just like the current from your house wall outlet. Then it uses a bridge rectifier, typically with 6 diodes, to convert the AC current to DC to send to the battery. With OUR 100% NEW Extreme Duty Dual Rectifier Alternator , you get 12 Diodes, which spreads the current load over a much larger area making the alternator twice as durable and twice as efficient at converting the AC current to DC power for the vehicle. The many benefits include: less heat build up, less current loss, higher amperage output when hot, more power at idle. Plus, the service duty and life increases substantially. When the rectifier heats up the diodes won't pass as much amperage through them, therefore, the amperage output drops. With our double rectifier alternator you have twice the amperage carrying capacity and double the cooling surface area to keep the diodes cool. This all adds up to......

MORE POWER, LESS HEAT PROBLEMS and GREATER RELIABILITY.

Directly replaces the following Lester numbers:

7564, 7565, 7641, 7659, 7660, 7662, 7663, 7664, 7666, 7667, 7668, 7670, 7671, 7683, 7976, 8010, 8011, 8012, 8013, 8026, 8027

Note: The 21 & 22 Si series alternator does not come with pulley

Remember, Our Dual Rectifier Alternators are 100% New so you don't pay a core charge. You also get to keep your old alternator.

Contact us if your not sure of your application. A great choice for installation on non-GM vehicles and other conversions.


Note:
Please provide vehicle year, make, model, engine, etc. on the comments page of the check out section to ensure proper fit for your vehicle. If you forget, we will call or e-mail for the application information before we ship. Extra shipping charges will apply for orders outside mainland USA

Standard Voltage Regulator (GM factory type hookup)

Your Price: Starting at $324.95

Standard hook-up, requiring the factory harness and activation leads. Great for low-RPM and 36 volt applications.

name description price add to cart
Part No. 2122SiDR154

New 21/22 Si type, 150 Amp Dual Rectifier alternator with Standard Heavy Duty Voltage Regulator Suggested Retail $449.95

$324.95
Part No. 2122SiDR170

New 21/22 Si type, 170 Amp Dual Rectifier alternator with Standard Heavy Duty Voltage Regulator Suggested Retail $489.95

$324.95
Part No. 2122SiDR200

New 21/22 Si type, 200 Amp Dual Rectifier alternator with Standard Heavy Duty Voltage Regulator Suggested Retail $549.95

$324.95
Part No. 2122SiDR250

New 21/22 Si type, 250 Amp Dual Rectifier alternator with Standard Heavy Duty Voltage Regulator Suggested Retail $729.95

$324.95

Self Exciting Voltage Regulator (No Factory Hookup)

Your Price: Starting at $344.95

Self-exciting hook-up, does not require the factory harness or activation leads. Great for higher-RPM and custom applications.

name description price add to cart
Part No. 2122SiDR140SE

New 21/22 Si type, 150 Amp Dual Rectifier alternator with Self-Exciting Voltage Regulator. Suggested Retail $489.95

$344.95
Part No. 2122SiDR170SE

New 21/22 Si type, 170 Amp Dual Rectifier alternator with Self-Exciting Voltage Regulator. Suggested Retail $529.95

$379.95
Part No. 2122SiDR200SE

New 21/22 Si type, 200 Amp Dual Rectifier alternator with Self-Exciting Voltage Regulator. Suggested Retail $589.95

$435.95
Part No. 2122SiDR250SE

New 21/22 Si type, 250 Amp Dual Rectifier alternator with Self-Exciting Voltage Regulator. Suggested Retail $735.95

$504.95