High Output Alternator for Jeep Grand Cherokee (1997-1998) 5.2L
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High-Output 250A Alternator for 1997-1998 Jeep Grand Cherokee (ZJ)
What it Does: The 250 Amp High Output Alternator upgrades the factory charging system on the 1997-1998 Jeep Grand Cherokee to eliminate low-voltage brownouts under auxiliary electrical demand and ensure steady charging current at idle.
The Stock Jeep Grand Cherokee Charging Deficiencies
Factory charging systems on the ZJ platform utilize stock 90A to 136A alternators designed strictly for base vehicle electrical draw. When running secondary equipment such as high-draw winches, auxiliary light bars, onboard air, or high-draw audio setups, the OEM unit experiences severe heat soak and diode breakdown. This leads to continuous voltage drops below 12.5V at idle, starving the ignition system, inducing rough running, and shortening deep-cycle battery life under sustained trail conditions.
The Engineering Solution
Manufactured in the USA, this heavy-duty 250-amp alternator overcomes OEM limitations with precision-wound heavy-gauge copper stators and high-temperature avalanche rectifiers engineered to dissipate thermal buildup efficiently. Delivering substantial amperage output even at low engine RPM, it maintains consistent 14.4V system voltage under extreme loads. It installs directly into the factory mounting brackets on the 5.2L Magnum V8, replacing standard OEM numbers including 56027913, 56041394, and 13742.
What's Included
- 1x 250 Amp High Output Alternator
Technical Specifications
| Fitment | 1997-1998 Jeep Grand Cherokee |
|---|---|
| Engine / Chassis | 5.2L Magnum V8 / ZJ |
| Stock Output | 220 hp / 300 lb-ft |
| Replaces OEM Part # | 13742, 334-1294, AL6526N, 56027913, 56041394, AL6526X, 13742N, 121000-4171, 121000-4170, 121000-4300, 13742-250 |
Compatibility
- 1997 Jeep Grand Cherokee 5.2L V8 (ZJ)
- 1998 Jeep Grand Cherokee 5.2L V8 (ZJ)
Frequently Asked Questions & Fitment Warnings
Does this fit the ZJ Grand Cherokee?
Yes, this is a direct fit for the 1997-1998 Jeep Grand Cherokee equipped with the 5.2L Magnum V8 engine.
Do I need to upgrade my factory wiring harness?
Yes, running an upgraded "Big 3" heavy-gauge charging cable (4-gauge or 1/0-gauge) and upgraded ground leads is strongly recommended to safely deliver 250 amps to your battery bank without resistance bottlenecking.
The Jeep Standard
Built to handle harsh backcountry vibration, deep water crossings, and high-load recovery operations, this high-output alternator provides the electrical reliability needed for heavy off-road use and demanding towing setups.
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