High Output Alternator for Nissan Altima Sentra (2002-2006) 2.5L

High-Output 250-Amp Alternator for 2002-2006 Nissan Altima, Sentra (L31 / B15)

What it Does: The 250-Amp High Output Alternator replaces the low-output factory charging unit on the 2002-2006 Nissan Altima and Sentra to eliminate voltage drop and deliver stable 14.4V power under heavy electrical loads.

The Stock Nissan Altima,Sentra Charging Limitation

The factory 100-amp to 110-amp Hitachi charging units (e.g., LR1100-734, 23100-8J000) found on the QR25DE struggle when subjected to aftermarket electronics, upgraded audio amplifiers, auxiliary lighting, or performance cooling fans. Under high electrical demand at idle, the stock diode bridge overheats, causing substantial voltage sag down into the 11.8V–12.2V range. This severe voltage drop impairs ignition coil output, starves fuel pump delivery, and accelerates premature battery wear.

The Engineering Solution

Engineered and manufactured in the USA, this heavy-duty 250-amp alternator features precision-wound, high-temperature copper stators and balanced rotors that provide massive current reserve even at engine idle speeds. It incorporates a heavy-duty rectifier with premium avalanche diodes, an internal low-resistance voltage regulator, and a cast-aluminum housing optimized for heat dissipation. The unit delivers sustained current flow to prevent heat soak failure and maintain charging rail stability without straining the engine bracket mounts.

What's Included

• 1 x 250-Amp High Output Alternator

Technical Specifications

Compatibility

• 2002-2006 Nissan Altima 2.5L (Base, S, SL)
• 2002-2006 Nissan Sentra 2.5L (SE-R, SE-R Spec V, Limited Edition)

Frequently Asked Questions & Fitment Warnings

Does this fit the L31 Altima and B15 Sentra?

Yes, this is a direct bolt-on fit for the 2002-2006 Nissan Altima and Sentra equipped with the QR25DE 2.5L engine. Does not fit 3.5L V6 (VQ35DE) or 1.8L (QG18DE) models due to completely different casing and mounting offsets.

Is a wiring upgrade required to run this 250A alternator?

Yes, performing a "Big 3" electrical upgrade using 0-gauge or 4-gauge battery, ground, and charge-lead cabling is required to safely transfer 250 amps without causing harness resistance bottlenecks.

The Nissan JDM Caliber

Built to handle the intense electrical strain of modified QR25DE builds, this heavy-duty charging system supplies rock-solid voltage to ignition coils, wideband sensors, and fuel systems under hard acceleration without parasitic drag.