The Prestolite IdlePro Extreme 12V 400-Amp Heavy Duty Alternator is optimized for fire truck applications to deliver improved output at low engine speeds. The high-performance brushless design helps reduce weight and size, and the Isolated Ground Technology helps reduce stray voltage and electrical noise, assisting to protect the engine. The alternator offers an auxiliary draft cooling design for cooler running temperatures, dual cable terminals, heavy duty eCoat for corrosion protection, and is remote sense capable. This alternator is covered by a three-year, 350,000-mile warranty.