Bosch’s ultra-premium Long Haul Alternator for heavy-duty vehicles provides greater electrical power and efficiency on the road or at idle, the company says, and is designed to keep generating electrical power even when underhood temperature climbs to as much as 125 degrees C (257 degrees F).

Producing 160 amps operating output, and 80 amps at idle, the Long Haul’s higher charge rate at idle prolongs battery life by reducing deep cycling. Plus, Bosch says it’s built to “really take the heat.” Dual internal cooling fans are optimized for air flow and help maintain even temperature under all operating conditions. Most other alternators fail at slightly over 110 C (230 F), Bosch claims.

The Long Haul’s exclusive self-protection regulator technology automatically reduces the output to prevent failure when underhood temperatures climb to 125 C. Output returns to normal when the temperature drops below that point.

The new alternator (AL9960LH), which replaces more than 220 different OE alternators, is claimed to operate at more than 70% efficiency while conventional OE replacements manage just 55%.

Backed by a 24-month, 250,000-mile warranty, Bosch says the high-efficiency Long Haul Alternator can save as much as $400 in fuel costs over 100,000 miles on the road.