100% exhaustive multipoint quality and performance testing

Ensures cranking and starting performance under all temperature extremes

Provide longer life and vibration free, quiet operation

Rotor slip ring machined to the toughest concentricity specifications in the industry

Increased brush life and reduced electrical interference on computer controlled vehicles

Voltage regulators and rectifiers 100% tested and replaced where required

Ensures stable voltage output, eliminates shorts and open circuits

Provides unsurpassed reliability under extreme conditions

Peace of mind

FREE, emergency roadside assistance

Available 24/7, within two years from date of purchase

The warranty can vary depending if the product is new or remanufactured as well as by product and application. For the complete warranty policy on alternators and starters (as well as other Bosch automotive products), go to www.boschservice.com and click on "Click here to view Limited warranty policy" on the bottom of the page. The next page that loads will be the limited warranty policy which you may print or download to your computer.

Only Bosch offers this value-added emergency roadside assistance program. Simply stated, if any Bosch Starter or Alternator fails within two years of the date of purchase, Bosch will provide a free jump-start or tow from a qualified roadside service provider. This exclusive Bosch service is available 24 hours a day, seven days a week, anywhere in the United States or Canada.

Yes! Bosch units are specifically engineered and built to deliver the same or better starting and charging power as the original equipment units they replace. Every component used to build Bosch Starters and Alternators is subject to the same rigorous Bosch Original Equipment quality standards. For example:

Yes! Bosch Premium Starters and Alternators are manufactured especially for extremes of heat, cold, and high demand. Each unit is built to last using the highest quality materials and the most technologically advanced processes, including:

Bosch has been supplying automotive parts for domestic applications that meet or exceed OE specifications for many decades. For example, Bosch is the original equipment supplier for late model Dodge, Jeep, GM, Saturn, and Chrysler vehicles. Worldwide, at plants in 10 countries, over 20 million starters and alternators are built annually for OE manufacturers.

Yes! The complete line of 100% New Premium Starters and Alternators are available for the most popular late model domestic and import vehicles and are built with the highest quality premium components. They’re specifically engineered to withstand excessive heat and high electrical demand. And all units are full-load tested to meet or exceed the original equipment manufacturer’s amperage and voltage output standards for proven starting and charging performance. All Bosch Remanufactured Alternators and Starters are designed to meet or exceed Original Manufacturers specifications and every unit is run through a rigorous multi-point physical and functional test procedure before it can be certified as a premium quality Bosch Remanufactured product.

Every Bosch Premium Starter and Alternator is application specific. In other words, it is a “one-for-one” match with the original equipment (OE) unit it is replacing.

No! When installing an alternator, the battery should be fully recharged before vehicle use. In many cases, depending upon how thoroughly discharged the battery is, it can take 4-8 hours. Most technicians and DIYers don’t want to wait that long so they just get the vehicle running, and figure that by driving the car around the alternator will charge the battery. In some cases with weather extremes the battery never gets fully charged, and in all cases the alternator is being overly stressed asking it to do a job it was not designed to do. This leads to premature failure.

Yes! Racing provides a great developmental impetus and test bed for alternator durability and performance, and what is learned at Daytona, Darlington, or Bristol helps to improve alternators installed in today’s cars and light trucks. Racing has led to improved cooling features, body designs, front and rear ball bearings, and has advanced the electronics in the alternator.

First, make sure the battery is fully charged. Depending on the state of the battery, this could take between 4-8 hours. You can not use the alternator to charge a battery as this will overly stress the alternator and could cause a premature failure. Second, check all battery cables and connections. It is good to clean any visible corrosion, but it is also necessary to perform a voltage drop test between the battery cable terminal at the battery and the opposite end of the same cable, whether it is at the starter, alternator, or a ground connection. If the cables are badly corroded, current can not adequately reach the battery to maintain the charge. This could again cause a premature failure of the alternator. See the Technical Info tab for a charging systems troubleshooting guide.

Warning: Never disconnect a battery cable while the engine is running to "test" the alternator. Doing so can cause high voltage spikes that can damage the alternator as well as other electronics.

Features such as larger bearings, improved circuitry, increased output, and additional provisions for cooling extend an alternator's life expectancy. These features reduce stress on the alternator and therefore increase its life. When shopping for a new or remanufactured alternator, always compare these features to make sure you are getting the highest quality, longest lasting alternator you can buy.

If the battery is okay but the engine still cranks slowly or not at all, it is time to check the starting system. The starter could have failed, or excessive resistance in the wires and their connections can prevent the proper voltage from reaching the starter causing slow or no cranking. Check for loose or dirty cable connections or for battery cables with wires that are too small in diameter (gauge). If the starter solenoid clicks but the starter does not operate, it is recommended to use a voltmeter to determine if the proper voltage is reaching the solenoid through the starter control circuit. If the solenoid is receiving the proper voltage and the starter does not crank, then the solenoid ground may be bad, the solenoid contacts may be damaged, or the starter is dead. If all connections are clean and tight and the voltage drop exceeds 0.2 volts, the solenoid should be replaced. If everything else checks out as okay, measure the starter draw and amperage, if incorrect, replace the starter. If the solenoid is defective but attached to the starter motor, it may be best for you to replace the complete starter and solenoid assembly- there's a very good chance the starter will die very soon along with the solenoid. Why risk a comeback and more delay getting the vehicle up and running. See the Technical Info tab for a starting systems troubleshooting guide.

For applications that demand high power, such as cars outfitted with mega-watt sound systems, Bosch offers High-Output Alternators that are 100% new and are engineered to produce maximum amperage at lower rpms. This allows the charging system to keep up with the amplifiers and eliminates battery rundown. These units can create up to 200 amps, which is nearly double the output of some stock units they replace. These alternators have been designed from the beginning to generate high output and have features such as additional copper wire windings in the stator, ceramic coated housings to handle high heat, Nomex® insulation (the same kind used in flame resistant clothing), soldered connections coated with silicone to reduce corrosion and protect against heat and vibration, and smaller diameter T6160 aircraft grade aluminum pulleys which reduce weight and allow the unit to spin faster at low rpm. Best of all, these units fit the same as the original and are designed as bolt-in direct replacements.