Bosch introduces 'Long Haul Extreme' alternators

The heavy duty alternators are designed to provide superior power output on the road and while idle.


Bosch has launched the new heavy duty Long Haul Extreme alternator, designed to provide superior power output on the road and at idle, with advanced electronics and design that ensure trouble-free operation, increased battery life and significant fuel savings.

“By optimizing brushed alternator technology and state-of-the-art electronics and components, Bosch is able to eliminate the need for brushless technology and provide a compact, lightweight, rugged 170- or 200-amp alternator highly suited for the severe operating conditions in today’s commercial vehicles,” said Fred Padgett, Group Product Manager, Starters and Alternators for Bosch. “The use of advanced technology in the new Long Haul Extreme brushed alternator (AL9920LL, AL9921LL, and AL9922LL) produces ‘extreme’ long life while exceeding the performance of brushless alternators. Furthermore, it weighs up to 34 percent less than brushless alternators,” he said.

Long Haul Extreme alternators come in 170- and 200-amp versions, producing respectively 170 and 200 amps at 6,000 alternator rpm operating output and 120 and 122 amps at 2,000 alternator rpm. The Long Haul's high charge rate at lower engine rpm prolongs battery life by reducing deep cycling.

According to Padgett, “The new Long Haul Extreme is built to operate under high temperature situations, with dual internal cooling fans optimized for maximum airflow to help maintain its even temperature under all operating conditions. It replaces more than 200 competitive alternator part numbers and operates at up to 74 percent efficiency, resulting in significant fuel savings versus brushless types that operate at 55 percent efficiency.”

“Long HaulExtreme is backed by Bosch's exclusive 36-month, 350,000-mile warranty, and advanced electronics and construction ensure fast installation and efficient, trouble-free operation,” he said.

Intelligent Battery Sense

Long HaulExtreme features Bosch ‘intelligent’ battery sense technology. If the vehicle into which the alternator is going already has battery sense, connect the vehicle’s wiring harness to the proper terminal on the voltage regulator and the Long Haul is ready to go to work. If the vehicle is not equipped with battery sense, there is no vehicle wiring harness connector to attach to the battery sense terminal, and the Long Haul alternator, with Bosch Intelligent Battery Sense, functions without a vehicle’s battery sense. No ‘jumper wire’ must be connected between the battery sense terminal and the B+ terminal of the alternator so that the alternator can function properly, as with other competitive brushless alternators.

This type of a jumper wire creates a potential for alternators to malfunction, due to a loose or badly connected jumper wire, especially on engines with severe vibration characteristics. Bosch Intelligent Battery Sense Voltage regulators reduce the chance for premature failure, and reduce the need for additional SKUs.

Bosch LongHaul Extreme Multifunction Regulator

Not only does the Bosch Long HaulExtreme voltage regulator have an intelligent battery sense function, but it also contains circuitry that allows it to operate/energize via a built in D+ terminal or as a ‘one wire’ alternator as well, with absolutely no modifications.

Optimized Brush Composition

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