• Protection from excessive charging or failure due to shorts in your car's wiring that can cause spikes or open circuits
• Consistent performance from manufacturing processes that exceed your vehicle's original specifications for wiring, bearings and components helping to resist heat and moisture
• Longer life of the alternator through the use of premium brushes and other critical components that resist failure or poor performance
• WAI units incorporate many features to optimize wear resistance and deliver consistent electric current, including OEM-Type Diodes on rectifier assemblies, welded diode to rectifier lead frame assembly, advanced components for the voltage regulators to decrease power/heat dissipation

The Amp Rating of your replacement alternator should provide at least as much amperage as your vehicle's factory electronics demand, plus any additional amperage needed to power electrical accessories added to the vehicle. There are several ways to determine your OE Amp Rating:

• OE Part - Check the Amp Rating stamped on the OE alternator (or if you see an OE Part Number, look it up on RockAuto.com), or


• Fuse Box Diagram - Add together the Amps listed on all the vehicle's Fuse Box Diagrams (under the hood and/or under the dash), or


• MultiMeter - Use a MultiMeter to individually measure the amp draw of major factory and aftermarket electronics with the engine off and then total those numbers. The replacement alternator should have an amp output at least 50% greater than that total, or


• Window Sticker - If it is still available, check the vehicle's factory window sticker to see if an optional higher output alternator was installed

When the battery goes dead, the condition of the battery and the alternator are two of the first things to check. However, do not assume that if the battery is good then the alternator must be bad and the cause of the problem.