Before I install a new alternator, what should I check?

First, make sure the battery is fully charged. 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. See the Support section 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.

What is the Bosch Ultimate Protection Plan for 100% New Alternators?

Only Bosch offers this value-added emergency roadside assistance program. If any Bosch 100% New Alternator fails within two years of the date of purchase, or registration 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.

Do Bosch Alternators deliver equally reliable performance?

Yes! 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.

How can I be assured my Alternator or Starter will fit when installed?

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

Will Bosch Premium Alternators and Starters provide the same performance as my original unit?

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 Alternators and Starter motors are subject to the same rigorous Bosch Original Equipment quality standards.