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Home / Electrical / Alternators / Hartzell Engine Tech /Prestolite Series Alternators - Factory Overhauled
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Prestolite Series Alternators - Factory Overhauled

15 Reviews 11 Answered Questions
From $1773.20 to $2894.10
Prices below incude GST
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Hartzell Part No. Volt/Amp Drive Replaces PN Price Buy
ALE-6520R12V/40ABeltALE-6420, Lyc LW-14302
08-07005
$2659.80
Quantity
ALE-8520R12V/40ABeltALE-8420, Lyc LW-14300
08-07006
$2798.40
Quantity
ALT-8520R24V/50ABeltALT-8420, CMI 652486
07-06404
$2512.40
Quantity
ALT-8521R24V/50ABeltALT-8421
08-07008
$2894.10
Quantity
ALT-9522R24V/50ADirectALT-9422, CMI 641668
07-06405
$2581.70
Quantity
ALU-6521RS24V/70ANo Pully/Belt ALU-6421LS, Lyc LW-14329
08-07009
$2432.10
Quantity
ALU-8521R24V/70ABelt ALU-8421
07-06406
$2651.00
Quantity
ALU-8521RS24V/70ANo Pully/BeltALU-8421LS, Lyc LW-14326
07-06407
$2546.50
Quantity
ALU-8532RLS28V/75A----
08-15661
$2437.60
Quantity
ALU-9522R24V/70ADirect--
08-07010
$2395.80
Quantity
ALX-8521R12V/70ABelt--
07-06421
$2537.70
Quantity
ALX-8521RS12V/70ANo Pully/Belt--
08-07014
$2483.80
Quantity
ALX-9524R12V/70ADirectCMI 641670
08-07016
$2435.40
Quantity
ALX-9525BR12V/70ADirectCMI 643008
07-06410
$2581.70
Quantity
ALY-6520R12V/60ABeltLyc LW-14333
08-07017
$2315.50
Quantity
ALY-6520RLS12V/60A----
08-15662
$2306.70
Quantity
ALY-6521R12V/60ABelt--
07-06411
$1773.20
Quantity
ALY-6522R12V/60ABelt--
08-07018
$2294.60
Quantity
ALY-6527R12V/60ABeltLyc LW-14315
08-07019
$2399.10
Quantity
ALY-8520R12V/60ABelt--
07-06412
$2546.50
Quantity
ALY-8520RS12V/60ANo Pully/BeltLyc LW-14313
08-07020
$2520.10
Quantity
ALY-8524R12V/60ABelt--
08-07021
$2387.00
Quantity
Subtotal $0.00
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Overview

We carry the full line of alternators, generators, and starters which are re-manufactured by Hartzell Engine Tech for installation in general aviation aircraft.

Prestolite series alternators see widespread use on OEM applications. This aircraft alternator line was originally developed by Prestolite, but the designs have continued to be refined and improved by Hartzell.

Fully FAA approved. All prices shown are exchange prices. Core charges are billed when unit is shipped. Core credit is issued upon return of acceptable like model core to us.

Attention: These charts are for reference only. Check owners manual or current part installed to verify the model required prior to puchase. NOTE: If core is not in stock at factory, customer must send core to us at time of order to have the core overhauled.

Core Return Policy:

Any unit being returned for core or warranty core credit shall be, as removed from the engine, complete and not disassembled. No core or warranty core credit will be allowed for automotive units. Units that are rusty or cannot be overhauled for any reason will be classified as scrap, having no value. Units which have been weld repaired, as well as units which have been disassembled and then reassembled with old parts, will also be classified as scrap, having no value. A percentage of the core value will be charged for all missing or damaged parts. At no time will the damaged or missing parts charge on any unit exceed the core value of that unit.

1. Core will only be accepted for credit 12 months from date of invoice.
2. Cores returned in excess of cores invoiced will not be accepted.
3. Cores must be of like purchase, a directly superseded unit or replaced unit when installing an STC'd product.
4. Competitive product cores are acceptable returns.
5. Cores must have a legible data tag for part and serial number verification.

Note: Customer will need to provide core for overhaul in the event our supplier does not have cores available to overhaul.

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Reviews

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Works great. Castle nut included. Make sure to order proper cotter pin, special wear washer and make sure you have the updated elastomeric coupling or else youll need to order that also.

Garrett B Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALX-9524R
December 30, 2025

Shipped in record time! Now installed and working well. Core being returned. Thank you!

Albert V Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALX-8521R
December 16, 2025

This product works well. In my situation, the alternator I pulled from the aircraft had an internal ground to the F2 terminal. These updated alternators no longer have that so I need to install a ground. Once I did that, everything worked as expected.

James B Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALX-9525BR
July 8, 2025

I was disappointed to find that there was no fan included with the ALT8520R alternator even though it was shown in the picture.

Lance F Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALT-8520R
March 18, 2025

the nd we use on our fleetfor decades.

Central A Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALT-8521R
October 25, 2023

Perfect fit, went right on no issues. Would be nice to have the trouble shooting guide included so I did not have to go download it but all in all was exactly what I expected.

Michael Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALU-8521R
August 3, 2023

good alterantors. we use a lot of them on our fleet.

Central A Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALT-8521R
March 29, 2023

excellent product

Aeronaves J Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALX-8521R
May 5, 2022

I asked for the alternator to be shipped to my A&P and that was not an issue. I’ve still not seen it but it’s charging my battery now. I hope for many hours and years to come.

Wayne P Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALY-8520R
February 24, 2022

Worked and fit as described

Flight L Verified Purchase

Hartzell Plane-Power Alternator Overhauled ALX-8521R
February 17, 2022

Q&A

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Please note, Aircraft Spruce Australia's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Australia assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is the ALU-8521 (08-07127) unit 70A?

Yes, part number 08-07127 is 24V / 70A.

Q: Do I understand right that ALU-8521 is a new alternator, not overhauled (and ALU-8521R is the overhauled one)? If we buy new alternator, will we pay an additional core price? If yes, how much?

Yes, that is correct. ALU-8521 is a new alternator and ALU-8521R is the overhauled version. If you buy a new alternator, there will be no additional core charge added to the order. The core program is only valid for purchases of overhauled alternators.

Q: I want to purchase an ALY-8520R alternator which supercedes my old unit which is ALY-8403. Is this acceptable for a core exchange?

Yes, this is an acceptable core.

Q: Does the ALY-8520R alternator come with a pulley and cooling fins?

Yes, this will come with the pully and cooling fan.

Q: Does the ALY-8520R have built-in over voltage protection?

No, the ALY-8520R does not incorporate internal regulation of any kind.

Q: Does the ALY-8520 come with the pulley?

Yes, it does.

Q: Is a Prestolite ALY-8420R an acceptable core exchange for an ALY-8520R? Additionally, is the 8520 as delivered a direct replacement for the 8420?

Yes that should be an acceptable core and 8520 superseded the 8420.

Q: I receive an alternator but it doesnt come with pulley. Can i know what part no. Does the pulleys of aly 6521r alternator? Thank you.

The pulley part number is 07-03391.

Q: What is the difference between an ALT-8520R and an ALT-8521R? Also the photos of both show a blast tube coming out out of the side of the alternator. The blast tubes come out of the back on the ALT-8520R and ALT-8521R not the side. The only difference we can see the direction the tube points.

The ALT-8520 is approved for TCM and ALT-8521 is approved for Lycoming.

Q: What are the warranty terms for these Prestolite overhauled alternators?

6 months from receipt.

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