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 28SI Alternator

If you manage or service school buses, utility vehicles, heavy duty trucks or other vehicles that have to contend with heavy electrical loads as part of their daily operating routine, then you know that reliability and durability matter—and the Delco Remy 28SI High Output Alternator is the most ideal product on the market to provide the reliability needed for such heavy duty applications.

Some of the 28SI’s unique features include:

• Duel internal fans: With a fan in the front and another in the back, dual internal fans provide greater circulation over the alternator’s electronics. As a result, the alternator runs at dramatically lower
temperatures and, most importantly, improves the operating efficiency and durability of the unit. With under-hood temperatures reaching as high as 125 ºC (257 ºF), the 28SI is designed for today’s applications.

 28si pad mount truck alternator

• Versatility: With output ranges of 160, 180 and 200 amps–as well as three different industry mounting styles–the 28SI meets the demands of multiple heavy duty applications that require extra power for today’s needs.

28si hinge mount alternator

Remote Sense: Highly accurate voltage readings optimize battery state-of-charge and result in improved efficiency and longer overall battery life. (Read related article.)

 Remote Sense: The Charge You Need
One of the biggest challenges fleet managers face is keeping truck batteries charged—particularly with the greater electrical demands on today’s trucks. But maintaining fully charged batteries is not an issue with the Delco Remy Remote Sense technology.

Remote Sense monitors voltage at the battery with a second wire that reads the actual voltage and signals the alternator to boost its output to compensate for any voltage drops. This increases the life of a battery and boosts its efficiency. In fact, it can improve battery charge time by as much as 50 percent. And, not surprisingly, that’s led to a decrease in warranty claims by 30 percent.

Alternators with Remote Sense are particularly effective on vehicles that make frequent stops, such as school buses, delivery trucks and trucks with lift gates. That’s why we’ve included it on our newest alternator models for heavy duty applications, including the 28SI
, 35SI, 36SI and 40SI.

When there’s a job to do, there’s no time to wait for batteries to charge– or worse–for them to be jumpstarted or replaced (not to mention the costs accompanied with both!). At the end of the day, Remote Sense can make the difference between batteries that are fully charged and those that aren’t and your customers’ ability to do their jobs as a result.
 Remote sense for 28si diagram

Tech Tip: Troubleshooting Remote Sense-Equipped Alternators

While the benefits of using Remote Sense-equipped alternators are clear, this advanced technology also adds a few additional – yet very simple – steps to traditional alternator diagnostics. Follow these few basic checks to ensure accurate diagnosis of the system.

Step 1: Begin at the batteries

As with any charging system, all troubleshooting begins at the batteries. Always be sure to visually inspect the batteries, make sure they are at a minimum 75% state of charge (12.3 – 12.4 volts), and that they pass a load test.

Step 2: Perform a voltage drop test

This test should be conducted on the main positive and negative cables connecting the alternator to the batteries. As a refresher, the battery cables should not show more than .5 volts (½ volt) loss between the alternator terminals and the battery terminals when the full rated output of the alternator is applied.

Step 3: Determine output voltage

Start the engine and connect a Digital Multi Meter to the positive and negative terminals of the alternator to determine the output voltage. It is normal to see an above-average output voltage (in the range of 14.7 – 14.9 volts) at the alternator terminals, since the job of the Remote Sense alternator is to compensate for cable resistance. Move the Digital Multi Meter to the battery terminals and observe the voltage there as well, which should be in the range of 14.0 – 14.4 volts.

Step 4: Check additional wiring

A properly-installed Remote Sense alternator will have a small wire that connects the alternator’s Remote Sense terminal to the batteries. Examine the full length of the wire for proper routing and signs of rub-through or abrasion.