How Foocles Relays Earned Customer Trust
To ensure stable and precise control of glow plug power supply, Foocles preheating relay employs high-reliability silver alloy contacts and pure copper coils, guaranteeing prompt circuit switching. This reduces energy consumption while extending the service life of the glow plugs.
As an experienced automotive relay manufacturer, our preheating relays are specifically engineered to operate in the high-temperature, high-vibration environment of the vehicle engine compartment. Their internally stable structure ensures reliable circuit performance, while the high-quality housing prevents corrosion damage.
You can also install a temperature sensor to automatically disconnect the preheating plug when it reaches a certain temperature and duration, preventing prolonged operation that could damage electrical components and ensuring vehicle safety.
Model of Preheating Relay
Core Benefits of Automotive Preheating Relay

Install using the overall flange assembly and secure the load with bolts.

150A high current helps the engine warm up quickly.

High-quality plastic casings offer corrosion resistance.

Supports various vehicles with 12V and 24V voltage specifications.
The Steadfast Guardian of Cold Starts for Diesel Vehicles
Struggling with rough starts and engine hesitation? Foocles preheating relay helps you conquer cold weather with ease, ensuring your diesel engine warms up quickly for instant starts! Whether facing bitter cold or rainy conditions, it guarantees smooth starts for your vehicle, keeping you on the road worry-free.
We also have several relay engineers available to assist you with any other issues you may encounter during the use of the preheating relay.


Energy Conservation & Environmental & Long Service Life
By precisely controlling the preheating duration through the ECU, energy waste is avoided and the starting efficiency of diesel engines is enhanced. This reduces fuel consumption and exhaust emissions while mitigating component wear, thereby extending the overall service life of the preheating system.
Choosing Foocles means choosing a win-win solution that combines environmental sustainability with economic efficiency. If you’re interested in our preheating relays, please feel free to contact us anytime.
Because diesel fuel ignites poorly at low temperatures, requiring a glow plug relay to control the operation of the glow plugs. This rapidly heats the fuel, ensuring the engine starts properly during cold starts.
It is not recommended, as preheating relays typically handle higher currents and longer energization periods. Standard relays are prone to overheating and burnout under such conditions.
- Inability to start or difficulty starting
- Preheating indicator light does not illuminate or stays illuminated
- Engine vibration after starting
- White smoke emanating from the exhaust pipe




