Alternator 4801778AF 12V 180A 6PK Jeep Grand Cherokee
Applicable models:JEEP Grand Cherokee
Reference part number:421000-7040 4210007040 421000-7041 4210007041 421000-7042 4210007042 421000-7200 4210007200 421000-704 421000704 MX421000-7041 4801778AL 56029789AA MX4210007041 P04801778AF 4801778AF 04801778AL 04801778AF 4801778AF
| Rated output : | 12V 180A |
| Pulley : | 6PK |
| Size : | 24*18*17 single unit inner box |
| Weight : | net weight：7.35KG gross weight：7.7KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
| Type : | ACgenerator Alternator |
| Specification : | 12V 180A |
| Pulley : | 6PK |
| Brand : | nuojin |
| Number : | 4801778AF 421000-7041 |
| Quality : | new |
| Delivery time : | 10 day |
Product Attributes
| Rated output | 12V 180A |
| Pulley | 6PK |
| Size | 24*18*17 CM single unit inner box |
| Weight | net weight: 7.35KG gross weight: 7.7KG |
| Packaging | Neutral kraft paper packaging |
| Spot/Pre sale | Spot goods |
| Warranty | 1 year |
Product Details
| Type | AC generator Alternator |
| Specification | 12V 180A |
| Pulley | 6PK |
| Brand | nuojin |
| Part Number | 4801778AF, 421000-7041 |
| Quality | new |
| Delivery time | 10 days |
Product Overview
The 4801778AF is a Chrysler Mopar-spec replacement alternator delivering 12V 180A output with a 6-rib (6PK) pulley, engineered for the Jeep Grand Cherokee. This high-output Lester-pattern aftermarket unit matches the original charging-system specification for this large SUV platform.
Fitted with internal regulator design, this brand-new alternator is stocked in-house with a 1-year warranty and 10-day dispatch lead-time. The 180-amp rating is factory-correct for the heavy electrical load of this large SUV, supporting climate control, heated and powered accessories, premium infotainment and factory electrical equipment.
Key physical specs: net weight 7.35 kg, gross weight 7.7 kg, overall dimensions 240 x 180 x 170 mm, supplied inside neutral kraft inner carton.
The Grand Cherokee Platform and 180A High-Output Charging System
The Jeep Grand Cherokee is a large SUV with a substantial factory electrical load, which is why the charging system is rated at 180A rather than a lower output. The 6-rib pulley matches the original accessory-belt layout, driving alternator, water pump and power-steering pump.
This high-output Lester-pattern unit is specified as 12V 180A, matching the factory charging-system specification of these platforms. Installing a pulley with the wrong rib count will cause belt mis-tracking, slippage, premature belt wear and charging faults. Always cross-check against your old alternator before ordering.
Technical Specifications
| Parameter | Specification |
|---|---|
| Chrysler Mopar OE numbers | 4801778AF, P04801778AF, 4801778AL, 04801778AL, 04801778AF, 56029789AA |
| Reference/OEM cross | 421000-7040, 4210007040, 421000-7041, 4210007041, 421000-7042, 4210007042, 421000-7200, 4210007200, 421000-704, 421000704, MX421000-7041, MX4210007041 |
| Voltage | 12V |
| Amperage | 180A |
| Pulley | 6-rib fixed pulley (6PK) |
| Regulator | Internal |
| Engine | Jeep Grand Cherokee petrol (verify engine code) |
| Quality | NEW |
| Warranty | 1 year |
| Net Weight | 7.35kg |
| Gross Weight | 7.7kg |
| Dimensions | 240 x 180 x 170mm |
| Packaging | Neutral kraft box |
| Lead Time | 10 days, in stock |
Engine Compatibility and Cross Reference
This alternator fits the Jeep Grand Cherokee. Do not rely solely on vehicle model name for fitment validation; always verify engine code, old-part OE number, pulley rib-count and amp label on your original alternator.
| Vehicle | Engine Code | Notes |
|---|---|---|
| Jeep Grand Cherokee | Verify engine code | Verify 6PK, 180A and mounting layout |
Multiple Mopar, Lester and supplier OE numbers appear across production batches and regional market specifications for this same alternator family. If your original unit bears one of the listed cross-reference numbers, 4801778AF serves as a direct drop-in replacement.
What to Look for in a Replacement
Follow these five verification steps before placing your order to avoid wrong-part returns:
1. Check the amperage label on your old alternator: confirm it is rated for 180A. Different amp ratings are not interchangeable.
2. Count pulley ribs: this unit requires 6PK (6-rib). Units with a different rib count are incompatible for this accessory drive setup.
3. Confirm engine code and production year of the Grand Cherokee match the original fitment.
4. Match against OE / reference part numbers stamped on your original housing.
5. Weight cross-check: genuine matching unit weighs approximately 7.35 kg net; significant weight difference indicates wrong assembly.
Application Scenarios
Independent repair shops and Jeep specialists servicing Grand Cherokee models across North America, Europe, Oceania, Asia-Pacific and Latin-American markets.
Parts counters and jobbers stocking American-brand SUV replacement electrical components.
Vehicle owners restoring and maintaining original-spec Jeep Grand Cherokee models.
Used-car export traders supplying pre-owned Jeep vehicles to global secondary markets.
Owners with heavy electrical accessories who require a factory-spec high-output charging system.
FAQ
Q: Which Jeep models does this alternator fit?
A: It fits the Jeep Grand Cherokee that uses the 12V 180A 6PK alternator family. Always verify against the OE number, pulley and mounting layout of your original alternator before ordering.
Q: Is this alternator new?
A: Yes, this is a brand-new high-output unit with a 1-year warranty and 10-day dispatch lead-time.
Q: My old alternator shows OE number P04801778AF or 421000-7041, will 4801778AF work?
A: Yes. These numbers belong to the same alternator family, differing only by production revision and market specification. It serves as a direct replacement.
Q: What is the normal charging voltage after installation?
A: With the engine running, output voltage should read 14.0V-14.7V. If it is lower than 13.8V or higher than 15V, check wiring or belt tension.
Q: What is your warranty and lead-time?
A: Goods are in stock with a 10-day dispatch lead-time. A 1-year warranty applies from installation date; warranty excludes damage caused by mis-installation, wrong belt tension, or vehicle-wiring faults.
In Practice
For technicians working on the Jeep Grand Cherokee platform: Before removing the existing alternator, perform charging-system diagnostics. Measure battery terminal running voltage with a multimeter. Weak batteries, corroded ground connections or a faulty main harness can mimic alternator failure symptoms. Always disconnect the battery negative terminal before commencing removal work.
Take photos of wiring connectors and bolt positions during disassembly to avoid mis-routing during reassembly. Observe correct belt tension: 10-15 mm deflection when pressing the belt mid-span. Over-tightened belts accelerate alternator bearing wear; loose tension creates slipping and insufficient charging. Torque mounting bolts to FCA workshop-manual specifications.
On vehicles equipped with an intelligent charging system, use an OBD scanner to perform generator initialization and BMS calibration after installation where required, so the system can correctly recognise charging status. Inexperienced home mechanics are recommended to entrust replacement work to a qualified auto-electric repair shop. Incorrect wiring risks burning the alternator or vehicle-system components.
References
Vehicle applications are compiled from the original equipment fitment data for the 4801778AF alternator family covering the Jeep Grand Cherokee, verified against actual vehicle installation tests and after-sales maintenance experience.
