Alternators

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Car Alternators: What You Need to Know

What is an Alternator?

It's the primary part of the charging system in your Subaru vehicle. Without one, that car or SUV you love wouldn't be able to run at all.

What Does One Do?

It turns mechanical energy, produced by moving parts, into electrical energy, or electricity (AC current). That charge gets converted into DC current, managed subsequently by a voltage regulator. Your vehicle can then use this power to run its many systems.

How Do Alternators Work?

The process starts with your Subaru engine. It runs serpentine and drive belts, which turn a pulley. The pulley then spins a rotor shaft, and the shaft rotates a set of magnetic coils.

The movement generates a magnetic field. A rectifier captures its energy, charging your car battery, running the radio, and activating the lights and digital displays on the dash. The electricity also powers things like the windows, steering, windshield wipers, and more -- even options like heated seats.

When an alternator goes bad, however, it often happens without any warning, and for one or more reasons.

So, What Causes Them to Fail?

Generally, worn or damaged alternator parts, or an overtightened alternator belt. Other primary causes include jump-starting your vehicle wrong and installing incompatible accessories in it. If you do get any warning, though, symptoms are usually many.

What are the Signs My Alternator is Going Bad, Then?

The most obvious is a battery indicator light or an alternator warning light. Another lighting and car electronics problems, if not a dead battery. One of the more telling symptoms, though, is a burning smell under your hood, near your battery or alternator. Others yet are leaking alternator fluid and a squeaky engine.

When Should I Replace it?

Your owner's manual should have a maintenance schedule you can refer to. Usually, it's every 7 years or every 80,000 to 150,000 miles, whichever comes first. Otherwise, to figure out the answer, do a thorough inspection, followed by a charging system test. If their results call for replacement, take care of it ASAP.

Your Best Bet for Maintaining Your Charging System: Install a Genuine Subaru Alternator

Looking to order one online? You're in luck: you can, right here at our auto parts store. It'll be OEM, too -- made for your Subaru model and guaranteed to fit it. Buy one now, and we'll ship it right to your address -- you'll be taking care of repairs in no time.

Alternator
Part Number: 23700AA970
Other Names: Alternator Ay More Names
Description: Crosstrek. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator
Part Number: 23700AA971
Other Names: Alternator Ay More Names
Description: Crosstrek. From 05/23/2017. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator
Part Number: 23700AA990
Other Names: Alternator Ay More Names
Description: BRZ. More Info
MSRP $578.81
$457.84
MSRP $578.81
$457.84
Alternator
Part Number: 23700AB01A
Other Names: Altntr Assembly More Names
Description: Legacy, Outback. 2.5l. More Info
MSRP $421.43
$339.25
MSRP $421.43
$339.25
Alternator
Part Number: 23708AA34A
Other Names: Rotor Ay Alternator More Names
Description: Legacy/Outback. 2.5l. To 12/4/12. More Info
MSRP $175.38
$121.01
MSRP $175.38
$121.01
Alternator
Part Number: 23700AA901
Other Names: Alternator Ay More Names
Description: XV Crosstrek. With hybrid. More Info
MSRP $1,220.42
$1,043.09
MSRP $1,220.42
$1,043.09
Alternator
Part Number: 23700AA98A
Other Names: Alternator Assembly More Names
Description: Impreza. More Info
MSRP $405.96
$326.80
MSRP $405.96
$326.80
Alternator
Part Number: 23700AA98B
Other Names: Altntr Assembly More Names
MSRP $405.96
$326.80
MSRP $405.96
$326.80
Alternator
Part Number: 23700AB13A
Other Names: Alternator Ay More Names
Description: 2.5L. More Info
MSRP $421.43
$339.25
MSRP $421.43
$339.25
Alternator
Part Number: 23700AB020
Other Names: Alternator Ay More Names
Description: Legacy, Outback. 3.6l. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator
Part Number: 23700AB16A
Other Names: Alternator Ay More Names
Replaces: 23700AB04A
Description: 2.4L turbo. More Info
MSRP $421.43
$339.25
MSRP $421.43
$339.25
Alternator
Part Number: 23700AA390
Other Names: Alternator Ay More Names
Description: Forester. Impreza. More Info
MSRP $670.24
$530.16
MSRP $670.24
$530.16
Alternator
Part Number: 23700AB051
Other Names: Altntr Assembly More Names
Replaces: 23700AB050
Description: Forester. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator
Part Number: 23708AA340
Other Names: Rotor, Rotor Assembly Alternator More Names
Description: Legacy/Outback. 2.5l. From 12/5/12. More Info
MSRP $218.12
$150.50
MSRP $218.12
$150.50
Alternator Bracket
Part Number: 11709AA110
Other Names: Bracket Alternator More Names
Description: With hybrid. More Info
MSRP $62.58
$44.68
MSRP $62.58
$44.68
Alternator Ay
Part Number: 23700AA3708A
Other Names: Alternator Ay More Names
Replaces: 23700AA370
Description: Forester. Impreza. 2.5l. 2.5L turbo. Baja. With turbo. More Info
MSRP $676.66
$535.24
MSRP $676.66
$535.24
Alternator Ay
Part Number: 23700AA4018A
Other Names: Altntr Assembly More Names
Replaces: 23700AA401
Description: Auto trans. Legacy. Outback. 3.0l. More Info
MSRP $670.07
$530.03
MSRP $670.07
$530.03
Alternator Ay
Part Number: 23700AA5108A
Other Names: Alternator Assembly More Names
Replaces: 23700AA510
Description: Fits Legacy, Outback, Tribeca\ \ Alternator\ Your alternator replenishes your battery when your car is running. If you have a battery... More Info
MSRP $609.56
$482.16
MSRP $609.56
$482.16
Alternator Ay
Part Number: 23700AA63B8A
Other Names: Alternator Ay More Names
Replaces: 23700AA63A, 23700AA63B
Description: Fits Legacy, Outback\ \ Alternator\ Your alternator replenishes your battery when your car is running. If you have a battery light, low... More Info
MSRP $405.95
$280.11
MSRP $405.95
$280.11
Alternator Ay
Part Number: 23700AA78A8A
Other Names: Alternator Ay More Names
Replaces: 23700AA78A
Description: From 12/5/12. 2.5L. More Info
MSRP $405.95
$280.11
MSRP $405.95
$280.11
Alternator Ay
Part Number: 23700AA911
Other Names: Altntr Assembly More Names
Replaces: 23700AA910
Description: WRX. Without hybrid. Impreza. Without turbo. 2.0L. XV Crosstrek. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator Ay
Part Number: 23700AA931
Other Names: Altntr Assembly More Names
Replaces: 23700AA930
Description: Legacy, Outback. 3.6l. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator Bolt
Part Number: 800708380
Other Names: Bolt More Names
Replaces: 800108710, 800708100
MSRP $2.58
$1.88
MSRP $2.58
$1.88
Alternator Bolt
Part Number: 808408120
Other Names: Bolt 8X60X60 More Names
Description: #2. More Info
MSRP $2.62
$1.90
MSRP $2.62
$1.90
Alternator Belt
Part Number: 809218260
Other Names: Accessory Drive Belt, V Belt 18X6X887 More Names
Replaces: 809218200
Description: 2.5L. Routing:Crk,Alt,Ps. Alternator and Power Steering. More Info
MSRP $17.27
$12.54
MSRP $17.27
$12.54
Alternator Belt
Part Number: 809218460
Other Names: Serpentine Belt, V Belt 18X5X874 More Names
Description: 2.5L. WRX STI. Impreza. With turbo, with sti. More Info
MSRP $31.25
$22.69
MSRP $31.25
$22.69
Alternator Belt
Part Number: SOA332X305
Other Names: A C Belt More Names
Replaces: 809221020
Description: With xt6 coupe. More Info
Notes: Order by description. More Notes
MSRP $44.95
$32.09
MSRP $44.95
$32.09
Alternator Bolt
Part Number: 010410200
Other Names: Stay Bolt, Turbocharger Mounting Bolt, Flange Bolt More Names
Replaces: 01041020A, 01041020G
Description: 2.5L turbo. More Info
MSRP $0.90
$0.54
MSRP $0.90
$0.54
Alternator Ay
Part Number: 23700AA00R
Other Names: Remanufactured Alternator More Names
Replaces: 23700AA000
Description: All models. Sedan, coupe, wagon. Power steering. P/s. Loyale. Auto trans. Without turbo, without ac. More Info
MSRP $233.40
$161.05
MSRP $233.40
$161.05
Alternator Ay
Part Number: 23700AA37AR1
Other Names: Remanufactured Alternator More Names
Replaces: 23700AA37A, 23700AA37A8A
Description: Manual trans. Legacy. All. Outback. 2.5l. Baja. Without turbo. More Info
MSRP $309.52
$213.57
MSRP $309.52
$213.57
Alternator Ay
Part Number: 23700AA430R1
Other Names: Remanufactured Alternator More Names
Replaces: 23700AA430
Description: 2.0, 2.5L. Impreza. 2.0l. More Info
MSRP $309.52
$213.57
MSRP $309.52
$213.57
Alternator Ay
Part Number: 23700AA751
Other Names: Altntr Assembly More Names
Replaces: 23700AA750
Description: BRZ. More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator Ay
Part Number: 23700AA831
Other Names: Alternator Ay More Names
Replaces: 23700AA620, 23700AA621, 23700AA830
Description: Fits Legacy, Outback, Tribeca\ \ Alternator\ Your alternator replenishes your battery when your car is running. If you have a battery... More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator Ay
Part Number: 23700AA871
Other Names: Altntr Assembly More Names
Replaces: 23700AA680, 23700AA681, 23700AA870
Description: Alternator.\ \ Fits Forester, STI, WRX\ \ Alternator\ Your alternator replenishes your battery when your car is running. If you have a... More Info
MSRP $527.76
$417.46
MSRP $527.76
$417.46
Alternator Ay
Part Number: 23700AB000
Other Names: Alternator Assembly More Names
Replaces: 23700AA921
Description: 2.5L. More Info
MSRP $535.71
$423.75
MSRP $535.71
$423.75
Regulator Alternator
Part Number: 23815AA161
Other Names: Reg Altntr More Names
Replaces: 23815AA160
Description: With turbo. Impreza. 2.5l. All. Legacy/Outback. 3.0l. Forester. Tribeca. Legacy/Outback. 2.5l. More Info
MSRP $343.88
$237.28
MSRP $343.88
$237.28
Alternator Hanger
Part Number: 10005AA031
Other Names: Hanger Engine More Names
Replaces: 10005AA030
MSRP $25.37
$18.42
MSRP $25.37
$18.42
Alternator Brace
Part Number: 11717AA060
Other Names: Alternator Plate, Mount Bracket Brace, Plate Alternator More Names
Replaces: 11717AA030
Description: 2.5L. All. 3.0L. 2.0L. More Info
MSRP $5.02
$3.64
MSRP $5.02
$3.64
Alternator Ay
Part Number: 23700AA7018A
Other Names: Alternator Ay More Names
Replaces: 23700AA700, 23700AA701
Description: Forester. Without turbo. With hybrid. More Info
MSRP $580.53
$459.20
MSRP $580.53
$459.20
Alternator Ay
Part Number: 23700AA91B
Other Names: Alternator Ay More Names
Replaces: 23700AA91A
Description: Fits Legacy, Outback\ \ Alternator\ Your alternator replenishes your battery when your car is running. If you have a battery light, low... More Info
MSRP $429.96
$340.10
MSRP $429.96
$340.10
Alternator Pulley
Part Number: 23752AA070
Other Names: Pulley, Pulley Altntr More Names
Description: WRX STI. 2.5L turbo. More Info
Notes: Included with alternator. More Notes
MSRP $95.72
$67.19
MSRP $95.72
$67.19
Alternator Bolt
Part Number: 808206030
Other Names: Bolt 6X20X18 More Names
MSRP $1.75
$1.27
MSRP $1.75
$1.27
Alternator Belt
Part Number: 809214010
Other Names: V Belt More Names
MSRP $22.95
$16.66
MSRP $22.95
$16.66
Alternator Belt
Part Number: 809218450
Other Names: Serpentine Belt, V Belt 18X5X882 More Names
Replaces: 809218300, 809218310, 809218380, 809218430
Description: 2.5L. Forester. With turbo. Without sti model. 2.0L. Impreza. 2.0. More Info
MSRP $22.95
$16.66
MSRP $22.95
$16.66
Alternator Belt
Part Number: 809221100
Other Names: Serpentine Belt, V Belt More Names
Replaces: 809221050
Description: 3.0L. More Info
MSRP $39.95
$28.52
MSRP $39.95
$28.52
Alternator Bolt
Part Number: 808208310
Other Names: Bracket Bolt, Bolt More Names
MSRP $1.64
$0.99
MSRP $1.64
$0.99
Alternator Bolt
Part Number: 808408150
Other Names: Alternator Mount Bolt, Bolt 8X99X33 More Names
Description: #1. More Info
MSRP $2.60
$1.89
MSRP $2.60
$1.89
Alternator Belt
Part Number: 809214070
Other Names: V Belt 14X5X730 More Names
MSRP $22.95
$16.66
MSRP $22.95
$16.66
Alternator Ay
Part Number: 23700AA5228A
Other Names: Alternator Assembly More Names
Replaces: 23700AA520, 23700AA521, 23700AA522, 23700AA570
Description: Fits Forester, Impreza, Legacy, Outback, STI, WRX\ \ Alternator\ Your alternator replenishes your battery when your car is running. If... More Info
MSRP $580.53
$459.20
MSRP $580.53
$459.20
Alternator Ay
Part Number: 23700AA5418A
Other Names: Alternator Assembly More Names
Replaces: 23700AA540, 23700AA541
Description: Forester. Impreza. 2.5l. With sti. With turbo. More Info
MSRP $569.96
$450.84
MSRP $569.96
$450.84

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