Warranty & Shipping
Product Reviews
Vehicle Fit


  • Brand New, Not Remanufactured 130 Amp Alternator
  • No core charge
  • Replaces dealer part number: XR3U-10300-AA, XR3U10300AA
  • Direct replacement
  • Built to strict quality control standards
  • Fits GT models with V8 4.6L SOHC Engine only

Fit guaranteed

  • This NEW alternator will install just as your original does.
  • Designed to fit your original engine brackets.
  • Your existing wiring harness will attach with no modification.


    • This Alternator will give you trouble free performance
    • Each unit is individually tested.
      • You'll receive a report with your alternator that shows its performance.
  • New vs. Remanufactured
    • Nothing is more frustrating than pulling off the side of the road with a failed alternator. That is why we carry only new alternators which are more reliable than remanufactured alternators.
    • Our Alternators are 100% NEW. Castings, pulleys, fans, hardware, internal parts, etc. are all new.
    • No Core Charge; No hassling with an old core
This replacement alternator is just what you need to get your vehicle in good working order again. If your battery is no longer being charged completely, or at all, this alternator may be the solution for you.

Our electrical and electronic parts are subject to strict quality control testing. Please ensure proper diagnosis of this item before purchasing as the item cannot be returned once installed or plugged in.

Item Condition: New

WARNING: Cancer and Reproductive Harm -

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

4.00/ 5.0
5 Stars
4 Stars
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1 Star
The part came in one day late, which isn’t a big thing. The part itself was great! No issues since I have replaced it. It also if a direct fit which is a plus.
September 20, 2018
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
Does it include regulator ?
Susan D December 21, 2015
From box to install
Julio valdes V December 21, 2015
Yes. All alternators for 99-04 mustangs have a built in regulator.
David D December 21, 2015
Hello, Yes the regulator is built in on these applications.
Brian F December 28, 2015
I have a 03 mach 1 would this work on it ??
Jose M August 7, 2017
It should work fine. It fit and works perfectly in mine. All websites say that it should fit the Mach 1
Jeremy S August 7, 2017
Year Make Model Description
1999-2004Ford Mustang Ford Mustang GT Alternator V8 4.6L SOHC
Part #: 1AEAL00447

Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout