Delco Remy 28SI™ High Output Brush Type Alternator

28SI High Output Brush Alternator
The 28SI high output alternator was designed to address vehicle applications that require higher electrical output, but also want lower weight, improved temperature capability, and fuel savings.  Vehicles, such as school buses, not using a premium high output alternator will likely experience premature failures due to high under-hood engine temperatures.  The 28SI brush style alternators are designed with dual internal fans which provide maximum cooling technology, improves the operating efficiency and durability of the unit. The 28SI comes standard with Remote Sense and is available in outputs ranging from 160 to 200 amps.  The 28SI is available in short J180 hinge, long J180 hinge, and pad mounting configurations.

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Performance Output 12 Volt 160, 180, & 200 Amps
24 Volt 110 Amps
Maximum Speed 10,000 RPM Continuous
12,000 RPM Intermittent
Rotation Clockwise
Temperature Rating 125°C / 257°F
Mounting J180 Short Hinge
J180 Long Hinge
Polarity Negative Ground
Efficiency 12 Volt 66%
24 Volt 76%
Weight 18.7 lbs / 8.5 kg
Stator Diameter 5.67 in / 144 mm
Length 9.27 in / 235.6 mm
Remote Sense Standard
*(US /Canada Only)
1 year / unlimited miles
2 year / unlimited miles - School Bus

Remote Sense

Remote Sense can reduce battery charge time by 50%. Some 35SI models are equipped with Remote Sense which utilizes a second wire that reads the actual to boost its output to compensate for the voltage drop, ensuring 14 Volts at the battery. The proper voltage forces more current into the battery bringing it to a full state of charge between vehicle stops.


28SI Lineart Pad Dimensions
28SI Lineart Short Hinge
28SI Lineart Long Hinge

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