Best Glow Plug Relays of 2025

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 6, 2025

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Glow plug relays are essential components in diesel engines that help to start the engine in cold weather conditions. They work by heating up the glow plugs, which in turn warm the engine's combustion chamber, making it easier to ignite the fuel. Glow plug relays are designed to control the amount of current that flows through the glow plugs, ensuring that they don't overheat and cause damage to the engine. These relays are available in a range of designs and configurations to suit different types of diesel engines and applications. They are highly reliable and durable, making them a popular choice among diesel engine owners and mechanics.

At a Glance: Our Top Picks

Dorman 904-194 Diesel Glow Plug Relay Cover #TOP 1
Dorman 904-194 Diesel Glow Plug Relay
ftb score rating icon 9.9
QWORK Glow Plug Relay Solenoid Replacement Cover #TOP 2
QWORK Glow Plug Relay Solenoid Replacement
ftb score rating icon 9.8
VORGENS Diesel Glow Plug Relay Module Cover #TOP 3
VORGENS Diesel Glow Plug Relay Module
ftb score rating icon 9.6

Top 10 Glow Plug Relays

#TOP 1

Dorman 904-194 Diesel Glow Plug Relay

904-194
Dorman 904-194 Diesel Glow Plug Relay Cover
Dorman 904-194 Diesel Glow Plug Relay Compatible with Select Ford Models

The Dorman 904-194 Diesel Glow Plug Relay is a direct replacement for the original relay in specified Ford models. This relay is a reliable solution for a damaged or failed original part, with durable construction from quality components. Backed by a team of US-based product experts with over a century of automotive experience, this relay ensures trustworthy quality. To ensure proper fit, input your vehicle's make, model, and trim level into the garage tool.

What We Like
Durable construction from quality components
Trustworthy quality backed by US-based experts with over a century of automotive experience
Direct replacement for damaged or failed original part
#TOP 2

QWORK Glow Plug Relay Solenoid Replacement

WD3182
QWORK Glow Plug Relay Solenoid Replacement Cover
QWORK Glow Plug Relay Solenoid OEM Style Replacement Compatible with Ford 1994-2003 F250 F350 F450, 1985-2003 E-Series Econoline E250 E350 Van

The QWORK Glow Plug Relay Solenoid is a high-quality replacement part for Ford F250, F350, F450, E250, and E350 van 1994-2003 models. Made from durable plastic and metal, it meets OEM specifications, and is easy to install with plug and play design. It replaces Ford part numbers F81Z12B533AC, F7TZ12B533CA3, F7TZ12B533A3, DY861, Prestolite 15-288, and SAZ4201J. The relay solenoid has a flat mounting base, 4 terminals, and voltage of 12. A 100% satisfaction guaranteed service is offered for one month.

What We Like
Durable and stable
Easy to install
Reliable replacement for original part
#TOP 3

VORGENS Diesel Glow Plug Relay Module

VORGENS
YC3Z-12B533-AA
Glow Plug Module
VORGENS Diesel Glow Plug Relay Module Cover
VORGENS Diesel Glow Plug Control Module, Relay Module Switch Fits for Ford F250/F350/F450 | E350/E450/E550 SuperDuty | Excursion, V8 Powerstroke Diesel Engine, 6.0L/6.4L/7.3L, 1999-2010

The VORGENS Glow Plug Relay is designed for various Ford Super Duty models, ensuring a perfect fit for your vehicle. It replaces several original equipment parts, making installation straightforward. This relay module effectively monitors and controls your engine's glow plugs, enhancing performance by optimizing their operation based on data from the engine control unit. Built to exceed OEM standards, it offers exceptional durability against wear and environmental damage. Plus, with a 180-day warranty, you can shop with confidence, knowing that your satisfaction is a priority.

What We Like
Easy installation
Enhanced engine performance
Durable construction
Compatible with multiple models
180-day warranty
#TOP 4

Standard Motor Products Glow Plug Relay RY-175T

RY-175T
Assorted
One Size
Standard Motor Products Glow Plug Relay RY-175T Cover
Standard Motor Products, Inc. - Glow Plug Relay (RY-175T)

The Standard Motor Glow Plug Relay is designed to enhance the performance of your vehicle's engine. With a compact size, measuring 2.54 inches in height, 4.63 inches in length, and 3.48 inches in width, it fits well in various engine compartments. Manufactured in China, this relay ensures reliable functionality, making it easier for you to start your vehicle, especially in colder conditions. Its efficient design helps in reducing wear and tear on the ignition system, ultimately improving your engine's longevity and performance.

What We Like
Compact size
Reliable functionality
Improves engine performance
Reduces wear and tear
#TOP 5

Dorman Diesel Glow Plug Relay

904-100
Dorman Diesel Glow Plug Relay Cover
Dorman 904-100 Diesel Glow Plug Relay Compatible with Select Chevrolet / GMC Models

The Dorman Glow Plug Relay is specifically designed to replace the original relay in select Chevrolet and GMC models. This product is a dependable option for anyone facing issues with a damaged or fatigued relay, ensuring your vehicle operates smoothly. Made with high-quality components, it promises long-lasting performance and reliability. With the backing of a team of experts with extensive automotive experience, you can trust its quality. Plus, by using the garage tool to input your vehicle's details, you can easily confirm a precise fit for your car.

What We Like
Direct replacement for original relay
Reliable performance and durability
Expert-backed quality assurance
Easy fit confirmation tool
#TOP 6

labwork 7.3L Glow Plug Relay

F81Z12B533AC
labwork 7.3L Glow Plug Relay Cover
labwork 7.3L Glow Plug Glowplug Relay Solenoid Replacement for Ford F-250 F-350 F-450

The labwork Glow Plug Relay is an essential replacement part for 1995-2002 Ford F-350 Econoline vehicles equipped with a 7.3L V8 engine. This relay ensures reliable operation, allowing your engine to start smoothly, especially in colder conditions. Its plug-and-play design makes installation straightforward, eliminating the hassle of complicated setups. Each unit comes in a sealed package, so you can trust that it's ready to install right out of the box. With part numbers that match several models, this glow plug relay is a practical choice for restoring your vehicle's performance.

What We Like
Easy installation
Reliable performance
Compatible with multiple models
Ready-to-use packaging
#TOP 7

A-Premium Glow Plug Relay Compatible with Ford Diesel Engines

APGPRM001
A-Premium Glow Plug Relay Compatible with Ford Diesel Engines Cover
A-Premium Diesel Glow Plug Control Relay Switch Module Compatible with Ford F-250/350/450/550, E-350/450/550 Super Duty 99-10, Excursion 00-05, PowerStroke, 6.0L 6.4L 7.3L, Replace# YC3Z12B533AA

The A-Premium Diesel Glow Plug Control Relay Switch Module is designed for Ford Super Duty trucks and Excursion SUVs with V8 Powerstroke Diesel Engines from 1999 to 2010. It is equipped with 7+7 Pins and rated voltage of 12V, functioning as a glow plug controller to ensure easy starting in cold weather. The part number is YC3512B533AA, YC3Z12B533AA, 904282, DY876, RY467, 1R1391, 904-282. This product is categorized as a Glow Plug Relay.

What We Like
Compatible with a wide range of Ford Super Duty trucks and Excursion SUVs
Equipped with 7+7 Pins and rated voltage of 12V for optimal performance
Functions as a glow plug controller to ensure easy starting in cold weather
#TOP 8

JZGRDN Glow Plug Relay & Controller Kit for Kubota D902 D905

JZGRDN
JZGRDN Glow Plug Relay & Controller Kit for Kubota D902 D905 Cover
JZGRDN Glow Plug Relay & Controller Kit 16415-65600 16415-65660 16415-65662 Compatible with Kubota D902 D905 L3710

This Glow Plug Relay and Controller Kit has three compatible part numbers and works with Kubota models D902, D905, D1005, V1305, and V1505. The relay also works with the V3300 model. The kit includes a 1-year warranty and offers quick customer service response times.

What We Like
Compatible with multiple Kubota models
Includes both Glow Plug Relay and Controller
1-year warranty
#TOP 9

Standard Motor Products SS591T Glow Plug Relay

Standard Motor Products SS591T Glow Plug Relay Cover
Standard Motor Products SS591T Glow Plug Relay

The Standard Motor Glow Plug Relay is a vehicle-specific relay that is designed to provide convenience and reliability for your vehicle's glow plug system. With a package height of 2.563 inches, package length of 10.125 inches, and package width of 6.938 inches, this relay is compact and easy to install. The SS591T model is known for its high performance and durability. It ensures that your glow plugs receive the necessary power to start your vehicle, especially in cold weather conditions. This glow plug relay is a must-have for anyone looking to improve their vehicle's starting capabilities and ensure a smooth and reliable ignition process.

What We Like
Convenient installation
Compact size
High performance
#TOP 10

GELUOXI DY-876 Diesel Glow Plug Relay

1828565C1 YC3Z12B533AA
GELUOXI DY-876 Diesel Glow Plug Relay Cover
GELUOXI DY-876 Diesel Glow Plug Control Relay Module Glow Plug Switch Replacement for 1999-2010 Ford F250 F350 Super Duty E350 Excursion 6.0L 7.3L 6.4L #YC3Z12B533AA 904-282

The GELUOXI Glow Plug Module is designed specifically for Ford diesel engines, providing an efficient replacement for your original control module. It ensures a perfect fit, making installation straightforward and hassle-free for you. Constructed with high-quality materials, this module can endure extreme temperatures and tough engine conditions, promising long-lasting reliability. Additionally, its compatibility spans various Ford models from 1999 to 2010, allowing you to confidently use it across different vehicles. With dedicated customer support available for six months after purchase, you can enjoy peace of mind knowing assistance is just a call away.

What We Like
Direct fit replacement
Durable and reliable
Wide compatibility
Customer support included
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What are the symptoms of a faulty glow plug relay?

Symptoms of a faulty glow plug relay include a flashing glow plug dashboard light or a check engine light when starting the car, difficulty starting the car, and the presence of white smoke until the engine warms up.

2. What does a glow plug relay do?

A glow plug relay is used by the glow plug control unit to switch the current on and off for the glow plugs. When there are multiple glow plugs, they are often distributed across two circuits with two glow plug relays to reduce the current needed.

3. Do I need a relay for glow plugs?

Yes, a relay is an essential part of the glow plug ignition system. It is necessary for the proper functioning of the glow plugs, especially in cold weather. If you need a replacement relay, you can find a selection of them at competitive prices.

4. What happens when your glow plug control module goes bad?

A bad glow plug control module or damaged glow plugs can cause white smoke during engine startup. Other possible causes of excess white smoke include low engine cranking speed, low compression, and air in the fuel system.

5. What will a bad glow plug cause?

A bad glow plug can negatively affect your engine's performance or even cause it to stop running. Unlike gasoline engines that rely on spark plugs, diesel engines use glow plugs to warm up the fuel/air mixture for combustion.

6. Can you start a diesel without glow plugs?

Yes, diesel engines can start without glow plugs. Most large diesel engines do not have glow plugs inside them. Glow plugs are not responsible for triggering the combustion process in a diesel engine. Their purpose is to warm up the fuel/air mixture to allow it to combust on its own.

7. Can faulty glow plug damage engine?

Yes, faulty glow plugs can harm your engine's performance or cause it to stop running. It is crucial to ensure that the glow plugs are in good working condition to maintain the proper functioning of the engine.

8. What tells glow plugs to come on?

The glow plugs are controlled by a glow plug control module. This module is located on the engine and receives input from the engine control unit. It uses a microprocessor to analyze this input and determine when to activate the glow plugs.

9. Are glow plugs just for starting?

No, glow plugs serve several important functions throughout the entire cycle of a diesel engine. They are not only used during initial ignition but also play a crucial role in the background of the engine's operation.

10. Can you drive with a bad glow plug control module?

You can drive with a bad glow plug control module, but it is not recommended. It is best to have it replaced as soon as possible to avoid continued poor performance and potential engine misfires.

11. How do you test a glow plug control relay?

To test a glow plug control relay, start by checking the battery voltage to the control module. If there is a voltage drop of over a half volt or more, it is a sign that the control module should be replaced.

Editor's Notes

During our glow plug relay research, we found 24 glow plug relay products and shortlisted 10 quality products. We collected and analyzed 6,814 customer reviews through our big data system to write the glow plug relays list. We found that most customers choose glow plug relays with an average price of $32.54.

The glow plug relays are available for purchase. We have researched hundreds of brands and picked the top brands of glow plug relays, including Dorman, QWORK, VORGENS, Standard Motor Products, labwork. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.