High Output Alternator for Jeep Grand Cherokee (1999-2000) 4.7L

High-Amp 200A Charging Upgrade for 1999-2000 Jeep Grand Cherokee (WJ)

What it Does: The high-output 200-amp alternator replaces the low-output factory charging unit on the 1999-2000 Grand Cherokee to deliver sustained amperage at idle and eliminate voltage drop under demanding auxiliary electrical loads.

The Stock Jeep Grand Cherokee Charging Deficit

The factory 136-amp alternator on the WJ platform quickly falls short when running winches, secondary light bars, high-draw electric cooling fans, or onboard audio gear. At low trail-crawling RPM, the OEM stator cannot generate sufficient current, allowing system voltage to collapse below 13.5 volts. This continuous discharge cycle forces the battery to sustain auxiliary loads, subjecting the OEM rectifier and diode packs to extreme thermal stress, leading to premature diode burnout, dimming headlights, and stranded trail rigs.

The Engineering Solution

Engineered for high-demand electrical systems, this direct-fit 200-amp unit features heavy-gauge pure copper stator windings and a dynamic high-speed balanced rotor for maximum flux density. Premium sealed bearings minimize mechanical drag and withstand continuous high-heat duty cycles. An internal solid-state voltage regulator maintains a flat 13.5V to 14.5V output window without spiking. It retains factory mounting geometry, OE pulley offsets, and original harness connectivity matching OEM part 13790 for seamless mechanical installation.

What's Included

• 1x 200-Amp High Output Alternator (Direct replacement for OE 13790)

Technical Specifications

Compatibility

• 1999 Jeep Grand Cherokee 4.7L V8 (WJ Chassis)
• 2000 Jeep Grand Cherokee 4.7L V8 (WJ Chassis)

Frequently Asked Questions & Fitment Warnings

Does this fit the WJ Grand Cherokee?

Yes, this unit is a direct bolt-on fit for 1999-2000 Jeep Grand Cherokee models equipped with the 4.7L PowerTech V8 engine; it does not fit the 4.0L inline-six.

Do I need to upgrade my charging cables?

While the unit connects directly to your OEM harness, upgrading the primary B+ charge lead and engine ground to a heavy 0-gauge circuit (Big 3 upgrade) is highly recommended to safely pull the full 200 amps without excessive line resistance.

The Jeep Standard

Built for the trail, this heavy-duty alternator ensures your WJ maintains full system voltage during low-speed rock crawling, heavy recovery winching, and remote overlanding runs where electrical failure is not an option.