Delco Remy's 33SI alternator provides more output and service life for today's diesel powered vehicles with large electrical load requirements. With the increased demand for extended service life products, Delco Remy's Brushless alternators are quickly becoming the standard of the industry. The standard load dump protection prevents voltage spikes from damaging the alternator due to loose connections or charging line interruptions. The 33si comes with a special coating for corrosion resistance.