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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 Trio for 1985-1991 Plymouth ColtAlternator Rectifier Diode With Trio for 1985-1991 Plymouth Colt
A-Premium®Part # APALR098
Alternator Rectifier Diode With Trio for 1985-1991 Plymouth Colt
52 Reviews
$30.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Plymouth Colt: 1985 1986 1987 1988 1989 1990 1991
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015LH5S
Note
This item is a 12 Volt, 6–35A block/ampere diode with 75 mm mounting length.
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Alternator Rectifier Diode with Heat Sinks for 2006-2009 Mercedes-Benz CLK350
A-Premium®Part # APALR086
Alternator Rectifier Diode with Heat Sinks for 2006-2009 Mercedes-Benz CLK350
52 Reviews
$30.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mercedes-Benz CLK350: 2006 2007 2008 2009
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015L7XH
Note
This item is a 12 Volt, 6-50A press-fit/avalanche diode with 129 mm OD, an M8×35 mm battery post (L) and an M8×22 mm battery post (R).
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Alternator Rectifier Diode with Heat Sinks for 2010-2011 Mercedes-Benz E350
A-Premium®Part # APALR086
Alternator Rectifier Diode with Heat Sinks for 2010-2011 Mercedes-Benz E350
52 Reviews
$30.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Mercedes-Benz E350: 2010 2011
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Quantity1
Item LocatedUnited States
ConditionNew
item #1015LD1Q
Note
This item is a 12 Volt, 6-50A press-fit/avalanche diode with 129 mm OD, an M8×35 mm battery post (L) and an M8×22 mm battery post (R).
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Alternator Rectifier Diode with Heat Sink for 2004-2006 BMW 325i
A-Premium®Part # APALR154
Alternator Rectifier Diode with Heat Sink for 2004-2006 BMW 325i
52 Reviews
$28.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits BMW 325i: 2004 2005 2006
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Quantity1
Item LocatedUnited States
ConditionNew
item #1016VLYY
Note
【Note-1】 12 Volt, 129mm OD, 6-50A Press-fit/Avalanche, With 129 mm Negative Heat Sink, With M8×26mm Battery Post(L), With M8×34.5mm Battery Post(R).
【Note-2】 This item comes without Airduct.
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Alternator Rectifier Diode for 1969-1970 1976-1987 Pontiac Acadian
A-Premium®Part # APALR069
Alternator Rectifier Diode for 1969-1970 1976-1987 Pontiac Acadian
52 Reviews
$19.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Pontiac Acadian: 1969 1970 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
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Quantity1
Item LocatedUnited States
ConditionNew
item #1016VRP4
Note
14 Volt, 86.4mm OD, 6-25 Ampere Button Diodes.
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Alternator Rectifier Diode for 1984-1990 Jeep Grand Wagoneer
A-Premium®Part # APALR069
Alternator Rectifier Diode for 1984-1990 Jeep Grand Wagoneer
52 Reviews
$19.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Jeep Grand Wagoneer: 1984 1985 1986 1987 1988 1989 1990
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Quantity1
Item LocatedUnited States
ConditionNew
item #1016VN4T
Note
14 Volt, 86.4mm OD, 6-25 Ampere Button Diodes.
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Alternator Rectifier Diode for 1985-1986 Pontiac Sunburst
A-Premium®Part # APALR069
Alternator Rectifier Diode for 1985-1986 Pontiac Sunburst
52 Reviews
$19.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Pontiac Sunburst: 1985 1986
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Quantity1
Item LocatedUnited States
ConditionNew
item #1016VRKH
Note
14 Volt, 86.4mm OD, 6-25 Ampere Button Diodes.
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Alternator Rectifier Diode for 1969-1970 1973-1988 Pontiac Grand Prix
A-Premium®Part # APALR069
Alternator Rectifier Diode for 1969-1970 1973-1988 Pontiac Grand Prix
52 Reviews
$19.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1016VL51
Note
14 Volt, 86.4mm OD, 6-25 Ampere Button Diodes.
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Alternator Rectifier Diode for 1975-1983 Pontiac Grand LeMans
A-Premium®Part # APALR069
Alternator Rectifier Diode for 1975-1983 Pontiac Grand LeMans
52 Reviews
$19.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #1016VRXT
Note
14 Volt, 86.4mm OD, 6-25 Ampere Button Diodes.
Show less
Alternator Rectifier Diode for 2011-2019 Ram 2500
A-Premium®Part # APALR076
Alternator Rectifier Diode for 2011-2019 Ram 2500
52 Reviews
$43.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Ram 2500: 2011 2012 2013 2014 2015 2016 2017 2018 2019
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Quantity1
Item LocatedUnited States
ConditionNew
item #10184095
Note
12 Volt, 128mm OD, 12-50 Avalanche Diodes, M8×59.5mm Battery Post.
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Alternator Rectifier Diode for 1991-1993 INFINITI G20
A-Premium®Part # APALR148
Alternator Rectifier Diode for 1991-1993 INFINITI G20
52 Reviews
$31.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits INFINITI G20: 1991 1992 1993
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Quantity1
Item LocatedUnited States
ConditionNew
item #10184KPC
Note
12 Volt, 85mm OD, 8-35 Ampere Diodes, With M5×44mm Battery Post
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Alternator Rectifier Diode for 1991-1994 Nissan Sentra
A-Premium®Part # APALR148
Alternator Rectifier Diode for 1991-1994 Nissan Sentra
52 Reviews
$31.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Nissan Sentra: 1991 1992 1993 1994
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Quantity1
Item LocatedUnited States
ConditionNew
item #10184ECX
Note
12 Volt, 85mm OD, 8-35 Ampere Diodes, With M5×44mm Battery Post
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Alternator Rectifier Diode for 2000-2004 Buick LeSabre
A-Premium®Part # APALR039
Alternator Rectifier Diode for 2000-2004 Buick LeSabre
52 Reviews
$30.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Buick LeSabre: 2000 2001 2002 2003 2004
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Quantity1
Item LocatedUnited States
ConditionNew
item #10183XY2
Note
12V, 116mm OD, 6-50A Avalanche Diodes, M6×53.5mm Battery Post
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Alternator Rectifier Diode for 2000-2002 Chevrolet C1500
A-Premium®Part # APALR039
Alternator Rectifier Diode for 2000-2002 Chevrolet C1500
52 Reviews
$30.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Chevrolet C1500: 2000 2001 2002
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Quantity1
Item LocatedUnited States
ConditionNew
item #101841W4
Note
12V, 116mm OD, 6-50A Avalanche Diodes, M6×53.5mm Battery Post
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Alternator Rectifier Diode for 1998-2000 Nissan Frontier
A-Premium®Part # APALR063
Alternator Rectifier Diode for 1998-2000 Nissan Frontier
52 Reviews
$28.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Nissan Frontier: 1998 1999 2000
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Quantity1
Item LocatedUnited States
ConditionNew
item #1018412P
Note
12 Volt, 114mm OD, 8-35 Ampere Diodes, M6×20.3mm Battery Post, M5×31.6mm Mounting Bolt
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Alternator Rectifier Diode with Trio for 1998 Mercedes-Benz CL500
A-Premium®Part # APALR109
Alternator Rectifier Diode with Trio for 1998 Mercedes-Benz CL500
52 Reviews
$57.99
Low stock: Only 2 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1998 Mercedes-Benz CL500
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #10183X9W
Note
【Note-1】 12 Volt, 122mm OD, 12-50A Avalanche Diodes, M8×30mm Battery Post.
【Note-2】 This item comes with Trio.
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Alternator Rectifier Diode with Trio for 1987 BMW L6
A-Premium®Part # APALR110
Alternator Rectifier Diode with Trio for 1987 BMW L6
52 Reviews
$31.99
Low stock: Only 5 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 1987 BMW L6
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #10183ZAV
Note
12 Volt, 120mm OD, 6-35 Ampere Press-fit, With Trio
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Alternator Rectifier Diode with Trio for 1987-1993 Volkswagen Fox
A-Premium®Part # APALR178
Alternator Rectifier Diode with Trio for 1987-1993 Volkswagen Fox
52 Reviews
$26.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Volkswagen Fox: 1987 1988 1989 1990 1991 1992 1993
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #10183WZ4
Note
14 Volt, 114mm OD, 6-35A Avalanche Diodes, M8×52.5mm Battery Post, M5×43.7mm Trio Post, with Trio.
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Alternator Rectifier Diode with Trio for 1986-1989 Volkswagen Scirocco
A-Premium®Part # APALR178
Alternator Rectifier Diode with Trio for 1986-1989 Volkswagen Scirocco
52 Reviews
$26.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Volkswagen Scirocco: 1986 1987 1988 1989
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #10183XZC
Note
14 Volt, 114mm OD, 6-35A Avalanche Diodes, M8×52.5mm Battery Post, M5×43.7mm Trio Post, with Trio.
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Alternator Rectifier Diode with Aluminum Heat Sink for 1983-1986 Nissan 720
A-Premium®Part # APALR136
Alternator Rectifier Diode with Aluminum Heat Sink for 1983-1986 Nissan 720
52 Reviews
$21.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits Nissan 720: 1983 1984 1985 1986
Check if this fits your vehicle
Quantity1
Item LocatedUnited States
ConditionNew
item #10184NT6
Note
14 Volt, 111mm OD, 6-35 Ampere Press Fit Diode, With M5×33.5mm Mounting Bolt
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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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