When lives are on the line and seconds count, count on Delco Remy High Output Brushless Alternators to provide the power need for emergency vehicles.  Our line of high output alternators are packed with valuable features from Remote Sense, to a durable brushless design, to providing the highest output at low engine speeds.  

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40SI^TM:  High Output at Low Engine Speeds

The Delco Remy 40SI Heavy Duty alternator provides superior output at low engine RPM.  With output at engine idle ranging from 160 amps to 190 amps at 12 volts, the 40SI provides the power needed to help restore batteries sooner.  The 40SI comes standard with Remote Sense and a 3 year / unlimited mileage warranty (applies to US and Canada) and is available in four 12 volt output ratings: 240, 275, 300, and 320 Amps.

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55SI^TM:  The Most Power for the Toughest Fire Truck Applications