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The 8 Best automotive alternator diodes of 2024

Are you trying to find automotive alternator diodes among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling automotive alternator diodes on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 13 hours of research and did 50 automotive alternator diodes tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best automotive alternator diodes you can buy today

SaleNo. 1
ACDelco Gold PT2288 (88862207) Alternator Connector
1,544 Consomer Reviews
ACDelco Gold PT2288 (88862207) Alternator Connector
  • Protective outer coverings provide long-lasting durability
  • Color-coded wires allow for easy installation
  • Manufactured to meet expectations for fit, form, and function
  • Provides the performance and dependability you expect from ACDelco
No. 2
GM Genuine Parts 12135037 Multi-Function Diode
  • Designed, engineered, tested, and warranted for GM vehicles.Fit Type: Vehicle Specific
  • Precise fit for ease of installation
  • For proper installation, locate your nearest GM dealer, independent service center, or body shop
SaleNo. 3
Painless Performance 30720 Alternator Backfeed Diode Kit
  • In some cases, the GM 10SI and 12SI alternators backfeed through the regulator excitation wire, not allowing the engine to be shutoff with the ignition switch
  • Kit allows you to stop alternator backfeeding by installing this diode inline on the ignition switched wire going to the regulators pin #1
No. 4
Painless Performance 80111 Replacement Diode Assembly for Race Car Switch Panels
  • Fit Type: Universal Fit
  • Accurate and easy installation
  • Innovative products
  • Skilled craftsmanship
SaleNo. 5
Delco Alternator Wiring Harness with Diode
1 Consomer Reviews
Delco Alternator Wiring Harness with Diode
  • Replaces Delco Remy Mfg nos 1105-143900
  • 1105-143900
  • All new, rebuilt and used tractor parts have a 1-year warranty
No. 6
10si 12 Si alternator charge wire plug with diode keeps alternator charging at low RPM 12AWG wire
  • ▲Delco alternator 10Si and 12Si alternator excit wire plug with diode
  • ▲Ready to plug into '73 & up GM internally regulated alternator
  • ▲Special diode prevents engine run and voltage feedback
  • ▲White wire length: 100CM; Red wire length: 20CM
  • ▲QUALITY ASSURANCE - Made of high quality material ,our wire plugis durable and can be used for a long time.
No. 8
Nikou Bridge Rectifier, Photovoltaic Anti Reverse Rectifier, MDK 50A 1600V Bridge Diode Rectifier Module, Diode, schottky diodes
  • ✅【HIGH QUALITY RECTIFIER BRIDGE】: A welded structure with good temperature and power cycling capability ensures more stable performance.
  • ✅【RECTIFIER BRIDGE SPECIFICATIONS】: Electric Current:150A ;Voltage:1600V ;Working Temperature:150℃(Max)
  • ✅【ADVANTAGE】: Durable and practical,Portable,very convenient to install and repair, small and lightweight,convenient to use.
  • ✅【APPLICATION】: Professional and practical design, easy to carry and use. Can be used to PWM inverter electric current input,battery charging,etc
  • ✅【QUALITY MATERIAL】: The diode rectifier is made of fine material and good craftsmanship for long service life.Adopts premium chip for good working performance.
No. 9
Alternator Diode 7321-9372-9R 119643-66900 1.1A For Yanmar 4TNV94 Engine Excavator
  • Part Number: 119643-66900, 11964366900, 7321-9372-9R, 732193729R
  • Charging Alternator Diode 1.1A
  • For Yanmar 4TNV94 Engine
  • Package: 1 pc
No. 11
Dorman 85193 1-Wire Universal In-Line Diode Compatible with Select American Motors / BMW / Hyundai Models
  • Direct replacement - this HVAC clutch coil connector matches the appearance and function of the factory hardware on specified applications
  • Ideal solution - this connector is a reliable replacement for an original part that is missing or has failed due to fatigue
  • Durable construction - this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality - backed by team of product experts in the United States and more than a century of automotive experience
  • Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
No. 12
MUYI 5 Pack Mini Diode 1A Multi-Function Fuses for Automotive Air Condition Resistor 1N914 Replacement Parts
  • Package Included: 5 pieces 1A (low volt) mini diode fuses. (The fuse holder shown in picture is not included.)
  • Made of high plastic materials,ensure maximum strength and durability for long lasting usage.
  • Has been tested strictly and advanced. Stable characteristics, high reliability.
  • Suitable for mini fuse holder. Easy installation, direct plug-in, time and cost reduction.
  • Manufacture part number: 12182137, instead of genuine parts 12135037.
No. 13
NTE Electronics 1N4007 Standard Recovery Rectifier Diode, General Purpose, Single, 1.0 A, 1000V (Pack of 20)
193 Consomer Reviews
NTE Electronics 1N4007 Standard Recovery Rectifier Diode, General Purpose, Single, 1.0 A, 1000V (Pack of 20)
  • Diffused Junction
  • Low Forward Voltage Drop
  • High Current Capability
  • High Surge Current Capability
  • RoHS Compliant
No. 15
ALLECIN 35 PCS 1N5349B 5W 12V Zener Diode 5349 5Watt 12Volt Power Diodes Automotive One Way Dioden DO-201AD Package
127 Consomer Reviews
ALLECIN 35 PCS 1N5349B 5W 12V Zener Diode 5349 5Watt 12Volt Power Diodes Automotive One Way Dioden DO-201AD Package
  • ALLECIN 1N5349B 5349 Zener Diode - Perfectly suitable for variety electronic experiments.
  • DC Power Dissipation at TL: 5W;Package Case: DO-201AD.
  • Features & Advantages: Long service life & Epoxy meets UL 94 V-0 flammability rating & Moisture Sensitivity Level 1
  • Widely Application: 1N5349B 5349 Zener Diode is widely used in various applications.
  • Humanized packaging for easy storage and use. # Printed markings for easy identification.
No. 16
ROADMASTER 690 Single Park Light Diode
  • Fit type: Universal.Fit Type: Universal
  • Package Dimensions: 1.27 H x 20.32 L x 13.716 W (centimetres)
  • Country of Origin : United States
  • Package Weight: 0.045 kilograms
No. 17
XYZIL 12V 1.1A Charging Alternator Diode 7321-9372-9R 119643-66900 Compatible with Yanmar Kohler Excavator 4TNV94 Engine
  • Part type: Charging Alternator Diode
  • Part Number: 119643-66900, 11964366900, 7321-9372-9R, 732193729R
  • Compatible with Yanmar Kohler Excavator 4TNV94 Engine
  • 12V 1.1A
  • Warranty: 1 Year.
No. 18
Omix-Ada | 17226.03 | Alternator Diode Trio | OE Reference: 8125177 | Fits 1976-1986 Jeep CJ
  • FITMENT | For 1976-1986 Jeep CJ
  • OE REFERENCE | 8125177
  • OMIX 17226.03 | Alternator Diode Trio
  • WARRANTY | Limited 5-Year Warranty
  • OMIX | Proudly offering all the parts you need to keep your Jeep running like new with quality standards that always meet or exceed those of the factory part.
No. 19
NTE Electronics 1N4004 Standard Recovery Rectifier Diode, General Purpose, Single, 1.0 A, 400V (Pack of 20)
  • Diffused Junction
  • Low Forward Voltage Drop
  • High Current Capability
  • High Surge Current Capability
  • RoHS Compliant
No. 20
LOERUMG Car Battery Tester 12V 24V Load Tester,100-2000CCA Automotive Alternator Tester Battery Analyzer Digital Charg System Tester Scan Tool Crank System Tester for Truck Marine Motorcycle SUV Boat.
  • 【Professional-grade Automotive Car Battery Tester】Easily accuracy test 12V 24V from 100 to 2000 CCA regular flooded, AGM flat plate/spiral, or gel batteries for an in-depth analysis for their optimum performance with upgraded copper clamp clip-on leads advanced technology, to get the battery's health, voltage, and charge status. More effortlessly read & understand of the test results to make it easy to save your time and bucks.
  • 【Display Full Testing Batteries Data】12V Car battery load tester efficiently assess the overall data of batteries like to measures cell health (SOH), Charge & Reset/Replace/Good & etc, and charge state(SOC) to avoid battery early failures and reduce repair, also provides the available power, CCA, cranking voltage/time, alternator output, and no-load/loaded voltage to ensure reliable performance. With polarity short-circuit protection to make sure vehicle's battery or personal safety.
  • 【Starter & Alternator Tester】: As for a higher performance Battery Charging System, the automotive battery tester efficiently diagnoses the charging system after cranking the engine by checking the output voltage of the alternator, rectifier diode, and charging current, aslo can test alternator's charging and starter's cranking conditions to ensure a regular charging system function to analyze battery by connected the tester’s clips with battery.
  • 【>99.5% Accuracy for Battery Health Check】: The battery analyzer applied with powerful chip and the latest testing algorithm improved the testing speed. And the tester can scan the battery and get precise readings for cranking voltage and time with clip-on leads,to cater your needs to take action, including the State of Health, the State of Charge, the Internal Resistance and the Testing Conclusion (Poor, Good, Great).
  • 【User - Friendly & Conveniently】:The battery load tester with extended cable provides maximum flexibility for user without asking for help from others. No app required, and keep the last rating to save time and hassle. The battery testing with a 2.8" Full Color large LCD display, operates through a menu system, easy to read for comfortable visual experience and supported 12 languages as a must-have tool for car owners.
  • 【Wide Application for Great Choice】: Our car battery tester is small and compact useing advanced conductance testing tech & upgraded copper clamp for stable communication & precise readings for auto shops, garages, and DIY users who frequently check batteries. Better chooice for 12V & 24V vehicles like SUVs, ATVs, electric mower, tractors, boats, motorcycles, agricultural machinery, construction machinery, bus to meet all your battery testing needs.
  • 【100% Warranty】:With ONE YEAR WARRANTY AND 100% SATISFACTION SERVICE , We always focus on each user’s experience to ensure a confident purchase. For any questions about the product, please contact us, you will get 7/24 hours technical support and satisfactory solutions.

How to choose a good automotive alternator diodes

Does the idea of finding a fantastic automotive alternator diodes make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in automotive alternator diodes. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top automotive alternator diodes products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top automotive alternator diodes on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top automotive alternator diodes brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top automotive alternator diodes based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the automotive alternator diodes were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good automotive alternator diodes, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your automotive alternator diodes.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting automotive alternator diodes for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our automotive alternator diodes. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what automotive alternator diodes should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on automotive alternator diodes.