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. 
Standard Voltage Regulator (GM factory type hookup)
$289.95....Part No. 2122SiDR150........New 21/22 Si type, 150 Amp Dual Rectifier alternator with
Suggested Retail $449.95                                                                      Standard Heavy Duty Voltage Regulator
$319.95....Part No. 2122SiDR170.....New 21/22 Si type, 170 Amp Dual Rectifier alternator with 
Suggested Retail $489.95                                                                      Standard Heavy Duty Voltage Regulator
$379.95....Part No. 2122SiDR200....New 21/22 Si type, 200 Amp Dual Rectifier alternator with
Suggested Retail $549.95                                                                      Standard Heavy Duty Voltage Regulator

$439.95....Part No. 2122SiDR250......New 21/22 Si type, 250 Amp Dual Rectifier alternator with
Suggested Retail $729.95                                                                      Standard Heavy Duty Voltage Regulator

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
 
 

Self Exciting Voltage Regulator  What is Self Exciting Voltage Regulator?

$299.95....Part No. 2122SIDR150SE....New 21/22 Si type, 150 Amp Dual Rectifier alternator with
  Suggested Retail $489.95                                                                        Self-Exciting Voltage Regulator
$329.95....Part No. 2122SIDR170SE.....New 21/22 Si type, 170 Amp Dual Rectifier alternator with 
  Suggested Retail $529.95                                                                        Self-Exciting Voltage Regulator    
$389.95....Part No. 2122SIDR200SE.....New 21/22 Si type, 200 Amp Dual Rectifier alternator with
  Suggested Retail $589.95                                                                        Self-Exciting Voltage Regulator
$449.95....Part No. 2122SIDR250SE.....New 21/22 Si type, 250 Amp Dual Rectifier alternator with
  Suggested Retail $735.95                                                                        Self-Exciting Voltage Regulator

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