How to disconnect and reinstall the alternator on Mazda RX-7?

Disconnect the negative battery cable at the battery and remove the air cleaner assembly along with its various hoses. Disconnect the wire from the wiring harness leading to the terminal on the rear of the alternator marked 'B' by sliding back the rubber protective boot and holding the wire while removing the nut and lock washer. Pull out the multiple connectors from the rear of the alternator and remove the main engine wiring harness from its clips at the alternator pivot bolt and air cleaner mounting bracket, moving the harness aside. Loosen the alternator strap bolt that fits through the adjusting bracket and the long pivot bolt by holding the nut on the rear side, then push the alternator through the adjusting bracket to relieve tension on the drive belt and slip the belt off the alternator pulley. Completely remove the adjusting bolt and long pivot bolt, noting the positions of the spacer and adjusting shim for reassembly. Lift the alternator off the engine and to install, place it in position and install the long pivot bolt through the mounting flanges and the mounting bracket of the water housing, ensuring the metal spacer is installed. Before tightening the pivot bolt or installing the small adjustment strap bolt, measure the clearance between the alternator and bracket; if it exceeds 0.0059 in (0.15 mm), install adjusting shims as necessary to prevent pinching of the mounting flanges. Tighten the pivot bolt and adjusting strap bolt only finger-tight to allow for free movement of the alternator for belt tension adjustment. Pull the drive belt over the alternator pulley and force the alternator against the belt until the tension is approximately 0.59 in (16 mm) when pressed halfway between the alternator pulley and eccentric shaft pulley. Tighten the adjusting bolt and pivot bolt with the nut, place the wiring harness back into position in its retaining clips, and check that none of the couplers or connections, other than the alternator ones, have been accidentally disconnected. Plug the multiple connectors back into the alternator, ensuring they fit correctly, and connect the wire to the 'B' terminal on the rear of the alternator, tightening the nut with the lock washer and covering the connection with the rubber boot. Finally, install the air cleaner assembly, reconnect the negative battery cable, start the engine, and check for proper operation.

How to replace an alternator on Mazda Protege?

In dismantling the alternator, remove the alternator and place it on a clean work bench. The next step is to remove the nut, lock-washer, pulley and the four small bolts situated behind the pulley. Next, take four big bolts which fasten the front cover to the rear housing and loosen them. Then remove the stator, the two bolts that attach the brush holding assembly, and the nut behind the rear housing that has the retainer. In case of replacing the brushes, the length of each brush available is measured and compared with the required minimum length; in case one of the brushes is shorter than the required minimum, change them. Make sure that every brush slides in the brush holder. In case of component check, check the continuity of the two slip rings, where resistance should be 3.5 to 4.5 ohms. Probe between slip rings and the rotor, and ensure that continuity is not present. Should one of the rotor tests fail or should the slip rings be worn out too much, it is flawed. Check also continuity between one end of one stator windings and the same end of the other, when open, stator is faulty. Also, inspect a grounded stator winding between each stator terminal and the frame. Test the rectifier with an ohmmeter to ensure continuity and change it in case it fails any tests. To put back together, assemble the parts in the same order they were removed, but be sure to press down each brush using a small screwdriver, this way the brush holder can be fitted.

Genuine Mazda Alternator

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73 Alternators found

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Mazda Alternator Part Number: PE01-18-300R-00
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Reman Alternator
- Replaced by: PE01-18-300
Fits the following Mazda Models:
- 3 | 2014-2016 | I Sport, I Touring, i Grand Touring, i SV, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2014-2017 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-5 | 2013-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: PAF2-18-300A
$285.64 MSRP: $380.93
You Save: $95.29 (26%)
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Product Specifications
- Replaces: PAF2-18-300
Fits the following Mazda Models:
- 3 | 2019-2022 | 2.0, 2.5 S, Base, Preferred, Premium, Select | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: ZJ38-18-300
$309.64 MSRP: $412.93
You Save: $103.29 (26%)
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Fits the following Mazda Models:
- 2 | 2011-2014 | Sport, Touring | 4 Cyl 1.5 L GAS
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Mazda Alternator Part Number: L3P9-18-300D
$468.76 MSRP: $630.18
You Save: $161.42 (26%)
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Product Specifications
- Replaces: L3P9-18-300A, L3P9-18-300C, L3P9-18-300B
Fits the following Mazda Models:
- 6 | 2006-2013 | Mazdaspeed, i | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- MX-5 Miata | 2006-2008 | Base, Club Spec, Grand Touring, SV, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda Alternator Part Number: L548-18-300B
$542.21 MSRP: $728.93
You Save: $186.72 (26%)
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Product Specifications
- Replaces: L548-18-300R-0B
Fits the following Mazda Models:
- 3 | 2010-2013 | S | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: L33G-18-300A
$731.56 MSRP: $999.61
You Save: $268.05 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: L33G-18-300, L33G-18-300R-00
Fits the following Mazda Models:
- 5 | 2012-2015 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-7 | 2007-2012 | Grand Touring, SV, Sport, Touring | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: PA5J-18-300
$251.86 MSRP: $335.89
You Save: $84.03 (26%)
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Fits the following Mazda Models:
- CX-5 | 2019-2025 | 2.5 S, 2.5 S Carbon Edition, Carbon Edition, Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: PGH4-18-300
$306.85 MSRP: $409.22
You Save: $102.37 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: PGH2-18-300
Fits the following Mazda Models:
- 3 | 2021-2025 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo Premium Plus, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-30 | 2022-2025 | 2.5 S, 2.5 S Carbon Edition | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: CY01-18-300A
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: CY01-18-300R-0B, CY01-18-300R-0A, CY01-18-300
Fits the following Mazda Models:
- 6 | 2009-2013 | S | 6 Cyl 3.7 L GAS
- CX-9 | 2007-2015 | Grand Touring, Sport, Touring | 6 Cyl 3.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda Alternator Part Number: PY1C-18-300
$593.79 MSRP: $798.26
You Save: $204.47 (26%)
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Fits the following Mazda Models:
- 3 | 2014-2018 | Grand Touring, I Sport, I Touring, Sport, Touring, i Grand Touring, i SV, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2014-2017 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: P31H-18-300R-00
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Reman Alternator
- Replaced by: P31H-18-300B
Fits the following Mazda Models:
- 3 | 2017-2018 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2017-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-3 | 2016-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS
- CX-5 | 2017-2021 | Carbon Edition, Grand Select, Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- MX-5 Miata | 2016-2025 | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF GT, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda Alternator Part Number: PX8E-18-300
$283.89 MSRP: $378.59
You Save: $94.70 (26%)
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Fits the following Mazda Models:
- CX-50 | 2023-2025 | 2.5 S, Hybrid Preferred, Hybrid Premium | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: LF1F-18-300R-0A
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Reman Alternator
- Replaced by: LF1F-18-300
Fits the following Mazda Models:
- 3 | 2007-2009 | Mazdaspeed, S, i | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Mazda Alternator Part Number: P53N-18-300C
$340.90 MSRP: $454.62
You Save: $113.72 (26%)
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Product Specifications
- Replaces: P53N-18-300, P53N-18-300A, P53N-18-300B
Fits the following Mazda Models:
- 3 | 2017-2018 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: B61P-18-300F
$467.16 MSRP: $628.02
You Save: $160.86 (26%)
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Fits the following Mazda Models:
- Miata | 1990-1993 | Base, LE, SE | 4 Cyl 1.6 L GAS
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Mazda Alternator Part Number: LFB6-18-300R-00
$202.96 MSRP: $266.40
You Save: $63.44 (24%)
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Fits the following Mazda Models:
- 5 | 2008-2010 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS
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Mazda Alternator Part Number: PY8V-18-300C
$655.74 MSRP: $895.99
You Save: $240.25 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Replaced by: PY8V-18-300E
- Replaces: PY8V-18-300D
Fits the following Mazda Models:
- 6 | 2018-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-5 | 2019-2025 | 2.5 Carbon Turbo, 2.5 Turbo, 2.5 Turbo Signature, Carbon Edition Turbo, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: PX4N-18-300
$271.94 MSRP: $362.66
You Save: $90.72 (26%)
Ships in 1-2 Business Days
ADD TO CART
Fits the following Mazda Models:
- 3 | 2021-2025 | 2.5 Carbon Turbo, 2.5 Turbo, 2.5 Turbo Premium Plus | 4 Cyl 2.5 L GAS
- CX-30 | 2021-2025 | 2.5 Carbon Turbo, 2.5 Turbo | 4 Cyl 2.5 L GAS
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Mazda Alternator Part Number: PEDD-18-300R-00
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Reman Alternator
- Replaced by: PEDD-18-300
Fits the following Mazda Models:
- 3 | 2015-2016 | I Sport, I Touring, i Grand Touring, i SV, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
View related parts
Mazda Alternator Part Number: P51X-18-300R-00
$289.74 MSRP: $386.40
You Save: $96.66 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Reman Alternator
- Replaced by: P51X-18-300B
Fits the following Mazda Models:
- CX-3 | 2016-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS

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1-20 of 73 Results

Mazda Alternator

Mazda Alternator helps keep the battery charged and powers every single light and gadget while the engine is running, making it a quiet hero of every trip. Mazda started producing vehicles in 1931 and has since made a name for itself with sporty handling, reliable engineering and daring Kodo styling that lends every car a sense of motion even when it's parked. The brand made headlines with its rotary engine ingenuity, then won fans over again with fuel-saving Skyactiv technology that squeezes more distance out of every drop of gas. Today Mazda combines responsive steering with i-Activsense driver's aids, all-wheel drive that is ready for rough weather, and new electric options that demonstrate a forward thinking spirit. All these characteristics combine to provide a fun yet responsible driving experience to appeal to individuals who love the road. The Mazda Alternator itself is sized in accordance with that energetic character. Spinning around by way of a belt attached to the crankshaft, the Alternator forces alternating current through copper windings, which is then flipped to smooth direct current by a built-in diode bridge that feeds the battery and sensitive electronics. Internal voltage control reacts instantly to changes in stereo volume or headlight usage so cabin tech never flickers. Strong bearings and an aluminum case help it stay cool and durable through the entire Mazda lineup, giving drivers confidence that the charge they need is always on tap.

You'll get great performance and real durability when you pick genuine OEM Alternator. Mazda builds these using high-quality materials and official factory methods to ensure they hold up mile after mile. You deserve that Mazda reliability without the headache of cheap knockoffs. It is easy to find exactly what you need in our huge inventory of genuine parts. Plus, every OEM part carries a real manufacturer's warranty for your peace of mind. You will love our low prices too. Order today and we will ship your brand-new parts fast. They often reach your door in just a few days.

Mazda Alternator Parts and Q&A

Alternator
N304-18-300R-00
Q:
How to disconnect and reinstall the alternator on Mazda RX-7?
A:
Disconnect the negative battery cable at the battery and remove the air cleaner assembly along with its various hoses. Disconnect the wire from the wiring harness leading to the terminal on the rear of the alternator marked 'B' by sliding back the rubber protective boot and holding the wire while removing the nut and lock washer. Pull out the multiple connectors from the rear of the alternator and remove the main engine wiring harness from its clips at the alternator pivot bolt and air cleaner mounting bracket, moving the harness aside. Loosen the alternator strap bolt that fits through the adjusting bracket and the long pivot bolt by holding the nut on the rear side, then push the alternator through the adjusting bracket to relieve tension on the drive belt and slip the belt off the alternator pulley. Completely remove the adjusting bolt and long pivot bolt, noting the positions of the spacer and adjusting shim for reassembly. Lift the alternator off the engine and to install, place it in position and install the long pivot bolt through the mounting flanges and the mounting bracket of the water housing, ensuring the metal spacer is installed. Before tightening the pivot bolt or installing the small adjustment strap bolt, measure the clearance between the alternator and bracket; if it exceeds 0.0059 in (0.15 mm), install adjusting shims as necessary to prevent pinching of the mounting flanges. Tighten the pivot bolt and adjusting strap bolt only finger-tight to allow for free movement of the alternator for belt tension adjustment. Pull the drive belt over the alternator pulley and force the alternator against the belt until the tension is approximately 0.59 in (16 mm) when pressed halfway between the alternator pulley and eccentric shaft pulley. Tighten the adjusting bolt and pivot bolt with the nut, place the wiring harness back into position in its retaining clips, and check that none of the couplers or connections, other than the alternator ones, have been accidentally disconnected. Plug the multiple connectors back into the alternator, ensuring they fit correctly, and connect the wire to the 'B' terminal on the rear of the alternator, tightening the nut with the lock washer and covering the connection with the rubber boot. Finally, install the air cleaner assembly, reconnect the negative battery cable, start the engine, and check for proper operation.
Alternator
Z599-18-300R-00
Q:
How to replace an alternator on Mazda Protege?
A:
In dismantling the alternator, remove the alternator and place it on a clean work bench. The next step is to remove the nut, lock-washer, pulley and the four small bolts situated behind the pulley. Next, take four big bolts which fasten the front cover to the rear housing and loosen them. Then remove the stator, the two bolts that attach the brush holding assembly, and the nut behind the rear housing that has the retainer. In case of replacing the brushes, the length of each brush available is measured and compared with the required minimum length; in case one of the brushes is shorter than the required minimum, change them. Make sure that every brush slides in the brush holder. In case of component check, check the continuity of the two slip rings, where resistance should be 3.5 to 4.5 ohms. Probe between slip rings and the rotor, and ensure that continuity is not present. Should one of the rotor tests fail or should the slip rings be worn out too much, it is flawed. Check also continuity between one end of one stator windings and the same end of the other, when open, stator is faulty. Also, inspect a grounded stator winding between each stator terminal and the frame. Test the rectifier with an ohmmeter to ensure continuity and change it in case it fails any tests. To put back together, assemble the parts in the same order they were removed, but be sure to press down each brush using a small screwdriver, this way the brush holder can be fitted.