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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 2005-2006 Toyota SiennaAlternator Rectifier Diode with Aluminum Heat Sinks for 2005-2006 Toyota Sienna
A-Premium®Part # APALR013
Alternator Rectifier Diode with Aluminum Heat Sinks for 2005-2006 Toyota Sienna
52 Reviews
$31.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Toyota Sienna: 2005 2006
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015232C
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 1976-1977 Mercury Capri
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1976-1977 Mercury Capri
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mercury Capri: 1976 1977
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015266C
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 1981-1986 Alfa Romeo GTV-6
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1981-1986 Alfa Romeo GTV-6
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Alfa Romeo GTV-6: 1981 1982 1983 1984 1985 1986
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Quantity1
Item LocatedUnited States
ConditionNew
item #10152191
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 1981-1989 Alfa Romeo Spider
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1981-1989 Alfa Romeo Spider
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Alfa Romeo Spider: 1981 1982 1983 1984 1985 1986 1987 1988 1989
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015269H
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 1966-1972 BMW 2000
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1966-1972 BMW 2000
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 2000: 1966 1967 1968 1969 1970 1971 1972
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Quantity1
Item LocatedUnited States
ConditionNew
item #101526EK
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 1981-1982 Lancia Zagato
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1981-1982 Lancia Zagato
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Lancia Zagato: 1981 1982
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Quantity1
Item LocatedUnited States
ConditionNew
item #101522U4
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 1992-1995 BMW 320i
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1992-1995 BMW 320i
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 320i: 1992 1993 1994 1995
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HNUW
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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Alternator Rectifier Diode for 1992-1995 BMW 325is
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1992-1995 BMW 325is
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 325is: 1992 1993 1994 1995
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015HRC4
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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Alternator Rectifier Diode for 1994-1995 BMW 540i
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1994-1995 BMW 540i
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 540i: 1994 1995
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HLTW
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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Alternator Rectifier Diode for 1993-1994 BMW 740i
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1993-1994 BMW 740i
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 740i: 1993 1994
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HLHK
Note
This item is a 12 Volt, 12–50A diode with 122 mm OD, an M8×30 mm battery post, and trio.
Show less
Alternator Rectifier Diode for 1993-1995 BMW 525i
A-Premium®Part # APALR079
Alternator Rectifier Diode for 1993-1995 BMW 525i
52 Reviews
$50.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 525i: 1993 1994 1995
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HLGQ
Note
This item is a 12 Volt, 12–50A diode with 122 mm OD, an M8×30 mm battery post, and trio.
Show less
Alternator Rectifier Diode for 1977-1978 Toyota Celica
A-Premium®Part # APALR137
Alternator Rectifier Diode for 1977-1978 Toyota Celica
52 Reviews
$28.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Toyota Celica: 1977 1978
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HN74
Note
This item is a 12 Volt, 8–35A diode with 87 mm OD and an M6 battery post (33°).
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Alternator Rectifier Diode for 1984 Toyota 4Runner
A-Premium®Part # APALR137
Alternator Rectifier Diode for 1984 Toyota 4Runner
52 Reviews
$28.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1984 Toyota 4Runner
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HL94
Note
This item is a 12 Volt, 8–35A diode with 87 mm OD and an M6 battery post (33°).
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Alternator Rectifier Diode for 1996-2004 Acura RL
A-Premium®Part # APALR143
Alternator Rectifier Diode for 1996-2004 Acura RL
52 Reviews
$27.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Acura RL: 1996 1997 1998 1999 2000 2001 2002 2003 2004
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015LACP
Note
This item is a 12 Volt, 8-50A press-fit diode with 113 mm OD and an M6 battery post (36°).
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Alternator Rectifier Diode with Trio for 1994-1999 BMW 318is
A-Premium®Part # APALR157
Alternator Rectifier Diode with Trio for 1994-1999 BMW 318is
52 Reviews
$29.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 318is: 1994 1995 1996 1997 1998 1999
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HPZ9
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 1994-1995 2001 BMW M3
A-Premium®Part # APALR157
Alternator Rectifier Diode with Trio for 1994-1995 2001 BMW M3
52 Reviews
$29.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW M3: 1994 1995 2001
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HQDX
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 Ground Screw Hole for 1992 Volvo 740
A-Premium®Part # APALR049
Alternator Rectifier Diode with Ground Screw Hole for 1992 Volvo 740
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1992 Volvo 740
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015L818
Note
This item is a 12 Volt, 8–50A cell/avalanche diode with 103 mm OD and an M8×50 mm battery post.
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Alternator Rectifier Diode with Negative Heat Sinks for 2005-2006 Cadillac Escalade EXT
A-Premium®Part # APALR155
Alternator Rectifier Diode with Negative Heat Sinks for 2005-2006 Cadillac Escalade EXT
52 Reviews
$26.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Cadillac Escalade EXT: 2005 2006
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015HNZE
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 1991-1993 BMW 318i
A-Premium®Part # APALR170
Alternator Rectifier Diode for 1991-1993 BMW 318i
52 Reviews
$26.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 318i: 1991 1992 1993
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015LASX
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 with Trio for 1967-1971 BMW 1600-2
A-Premium®Part # APALR033
Alternator Rectifier Diode with Trio for 1967-1971 BMW 1600-2
52 Reviews
$34.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 1600-2: 1967 1968 1969 1970 1971
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1015226S
Note
【Note-1】 14 Volt, 114mm OD, 6-35A Diodes, M6×52.5mm Battery Post.
【Note-2】 This item comes with Trio.
Show less
Page 22 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.