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Alternator Rectifier Bridge

1376 items

An alternator rectifier bridge uses diodes to convert alternating current into direct current for the vehicle's electrical system. Choose the bridge for the alternator design, comparing assembly layout, connections and mounting. It is a service component within the alternator rather than a complete alternator replacement.

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Alternator Rectifier Diode with Aluminum Heat Sinks for 2007-2013 Toyota TacomaAlternator Rectifier Diode with Aluminum Heat Sinks for 2007-2013 Toyota Tacoma
A-Premium®Part # APALR013
Alternator Rectifier Diode with Aluminum Heat Sinks for 2007-2013 Toyota Tacoma
52 Reviews
$31.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Toyota Tacoma: 2007 2008 2009 2010 2011 2012 2013
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015256Y
Note
【Note-1】 14 Volt, 117mm OD, 12-35A Avalanche Diodes, M6×33mm Battery Post.;
【Note-2】 This item comes with Aluminum Heat Sinks.
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Alternator Rectifier Diode with Trio for 1978-1979 Alfa Romeo Sport
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1978-1979 Alfa Romeo Sport
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Alfa Romeo Sport: 1978 1979
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Quantity1
Item LocatedUnited States
ConditionNew
item #101522XK
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode with Trio for 1980 Volvo 265
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1980 Volvo 265
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1980 Volvo 265
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Quantity1
Item LocatedUnited States
ConditionNew
item #101524XC
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode with Trio for 1978-1981 BMW 733i
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1978-1981 BMW 733i
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 733i: 1978 1979 1980 1981
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Quantity1
Item LocatedUnited States
ConditionNew
item #101524AE
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode with Trio for 1974-1980 Volkswagen Dasher
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1974-1980 Volkswagen Dasher
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Volkswagen Dasher: 1974 1975 1976 1977 1978 1979 1980
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Quantity1
Item LocatedUnited States
ConditionNew
item #101525RY
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode with Trio for 1976-1983 Fiat 124
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1976-1983 Fiat 124
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Fiat 124: 1976 1977 1978 1979 1980 1981 1982 1983
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Quantity1
Item LocatedUnited States
ConditionNew
item #101525WL
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode for 1987 Chevrolet R30
A-Premium®Part # APALR041
Alternator Rectifier Diode for 1987 Chevrolet R30
52 Reviews
$26.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1987 Chevrolet R30
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Quantity1
Item LocatedUnited States
ConditionNew
item #101526LQ
Note
12 Volt, 80mm OD, 6-25 Ampere Button.
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Alternator Rectifier Diode for 1975-1980 1982-1986 Chevrolet C30
A-Premium®Part # APALR041
Alternator Rectifier Diode for 1975-1980 1982-1986 Chevrolet C30
52 Reviews
$26.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Chevrolet C30: 1975 1976 1977 1978 1979 1980 1982 1983 1984 1985 1986
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Quantity1
Item LocatedUnited States
ConditionNew
item #101526NV
Note
12 Volt, 80mm OD, 6-25 Ampere Button.
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Alternator Rectifier Diode for 1978-1979 1981 1983-1987 1989-1990 Chevrolet G20
A-Premium®Part # APALR041
Alternator Rectifier Diode for 1978-1979 1981 1983-1987 1989-1990 Chevrolet G20
52 Reviews
$26.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Chevrolet G20: 1978 1979 1981 1983 1984 1985 1986 1987 1989 1990
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015234V
Note
12 Volt, 80mm OD, 6-25 Ampere Button.
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Alternator Rectifier Diode with Negative Heat Sinks for 2005-2007 GMC Sierra 1500
A-Premium®Part # APALR155
Alternator Rectifier Diode with Negative Heat Sinks for 2005-2007 GMC Sierra 1500
52 Reviews
$26.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits GMC Sierra 1500: 2005 2006 2007
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HPEE
Note
【Note-1】 This item is a 12 Volt, 6–50A press-fit/avalanche diode with 129 mm OD, an M8×22 mm battery post (L), and an M6×51 mm battery post (R).
【Note-2】 This item comes with 129 mm negative heat sink.
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Alternator Rectifier Diode with Negative Heat Sinks for 2005-2006 Cadillac Escalade
A-Premium®Part # APALR155
Alternator Rectifier Diode with Negative Heat Sinks for 2005-2006 Cadillac Escalade
52 Reviews
$26.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Cadillac Escalade: 2005 2006
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HQR0
Note
【Note-1】 This item is a 12 Volt, 6–50A press-fit/avalanche diode with 129 mm OD, an M8×22 mm battery post (L), and an M6×51 mm battery post (R).
【Note-2】 This item comes with 129 mm negative heat sink.
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Alternator Rectifier Diode for 2004-2009 Mitsubishi Galant
A-Premium®Part # APALR047
Alternator Rectifier Diode for 2004-2009 Mitsubishi Galant
52 Reviews
$28.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mitsubishi Galant: 2004 2005 2006 2007 2008 2009
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HP3Z
Note
This item is a 12 Volt, 6–30A avalanche diode with an M5×44 mm battery post.
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Alternator Rectifier Diode with Trio for 1993 Mercedes-Benz 300TE
A-Premium®Part # APALR157
Alternator Rectifier Diode with Trio for 1993 Mercedes-Benz 300TE
52 Reviews
$29.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1993 Mercedes-Benz 300TE
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HP54
Note
【Note-1】 This item is a 14 Volt, 6–50A avalanche diode with 107 mm OD and an M8×49 mm battery post.
【Note-2】 This item comes with trio & "W" Terminal.
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Alternator Rectifier Diode with Trio for 1997-1998 Mercedes-Benz C230
A-Premium®Part # APALR157
Alternator Rectifier Diode with Trio for 1997-1998 Mercedes-Benz C230
52 Reviews
$29.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mercedes-Benz C230: 1997 1998
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HQYD
Note
【Note-1】 This item is a 14 Volt, 6–50A avalanche diode with 107 mm OD and an M8×49 mm battery post.
【Note-2】 This item comes with trio & "W" Terminal.
Show less
Alternator Rectifier Diode with Trio for 1993-1995 Audi 90
A-Premium®Part # APALR157
Alternator Rectifier Diode with Trio for 1993-1995 Audi 90
52 Reviews
$29.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Audi 90: 1993 1994 1995
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HKUL
Note
【Note-1】 This item is a 14 Volt, 6–50A avalanche diode with 107 mm OD and an M8×49 mm battery post.
【Note-2】 This item comes with trio & "W" Terminal.
Show less
Alternator Rectifier Diode for 2003-2008 INFINITI FX35
A-Premium®Part # APALR001
Alternator Rectifier Diode for 2003-2008 INFINITI FX35
52 Reviews
$32.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits INFINITI FX35: 2003 2004 2005 2006 2007 2008
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HN29
Note
【Note-1】 This item is a 12 Volt 6-35A avalanche diode with 100 mm OD and an M8×59.5 mm battery post.
【Note-2】 This item comes without trio and capacitor.
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Alternator Rectifier Diode for 2008-2009 Pontiac G8
A-Premium®Part # APALR001
Alternator Rectifier Diode for 2008-2009 Pontiac G8
52 Reviews
$32.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Pontiac G8: 2008 2009
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HLYU
Note
【Note-1】 This item is a 12 Volt 6-35A avalanche diode with 100 mm OD and an M8×59.5 mm battery post.
【Note-2】 This item comes without trio and capacitor.
Show less
Alternator Rectifier Diode for 2008-2010 Mitsubishi Outlander
A-Premium®Part # APALR001
Alternator Rectifier Diode for 2008-2010 Mitsubishi Outlander
52 Reviews
$32.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mitsubishi Outlander: 2008 2009 2010
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HQ5K
Note
【Note-1】 This item is a 12 Volt 6-35A avalanche diode with 100 mm OD and an M8×59.5 mm battery post.
【Note-2】 This item comes without trio and capacitor.
Show less
Alternator Rectifier Diode for 1986-1993 Volkswagen Cabriolet
A-Premium®Part # APALR170
Alternator Rectifier Diode for 1986-1993 Volkswagen Cabriolet
52 Reviews
$26.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Volkswagen Cabriolet: 1986 1987 1988 1989 1990 1991 1992 1993
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015LCP1
Note
This item is a 12 Volt, 6–35A diode with 114 mm OD, an M8×52.5 mm battery post, an M5×43.7 mm trio post, and trio.
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Alternator Rectifier Diode for 1998-1999 BMW 323i
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1998-1999 BMW 323i
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 323i: 1998 1999
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HL98
Note
This item is a 12 Volt, 12–50A diode with 122 mm OD, an M8×30 mm battery post, and trio.
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Page 18 of 69

Alternator Rectifier Bridges

An alternator rectifier bridge uses diodes to convert the alternator's alternating current into direct current for the vehicle's electrical system. It is one part of the alternator, rather than a complete replacement alternator.

A-Premium offers rectifier assemblies for selected alternators. Their size, connections and internal diode configuration can differ, so select a bridge for the specific alternator being repaired.

Choosing An Alternator Diode Bridge

Identify the alternator and compare the replacement's mounting shape, outside diameter and electrical connections. The vehicle application helps narrow the choices, but the rectifier must also match the alternator installed in the vehicle.

A charging warning or a weak battery does not identify a failed rectifier by itself. The battery, drive belt, wiring and voltage regulator are also part of the charging-system diagnosis.

Frequently Asked Questions (FAQ)

What is the difference between a rectifier and a voltage regulator?

The rectifier converts alternating current to direct current; the regulator controls alternator voltage for the operating conditions. They perform different jobs even when both are mounted on the alternator.

Can a faulty alternator diode drain the battery when parked?

A faulty diode can contribute to battery discharge while the vehicle is off. Other electrical loads and battery problems can also cause a drain, so the charging system needs a proper diagnosis.

Why does the battery-post size matter?

The post connects the charging output to the vehicle's electrical cable. Its diameter and length must suit the connection and available space; an M6 post and an M8 post are different mounting specifications.

What do the heat sinks on a rectifier do?

A heat sink helps transfer heat away from the electronic components. Some A-Premium bridge listings identify aluminum heat sinks, but the design and supplied parts vary by product.

Can I disconnect the battery while the engine runs to test charging?

Keep the battery connected while the alternator is operating. HELLA warns that disconnecting the battery or connections with the engine running can create voltage spikes and damage components; use the specified diagnostic procedure instead.

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