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Bolec WL601 Low Water Level Alarm Kit 7sec Delay 12/24VDC



Introducing the BOLEC Radiator Level Alarm, your reliable companion for safeguarding automotive radiators. This state-of-the-art WL601 water level alarm is engineered to provide an immediate alert when your radiator’s water level dips below a predetermined threshold.

How does it work? This innovative module utilizes a unique method of measuring resistance through the radiator water, effectively holding the relay contact open. If the water level falls below the probe, a high resistance is detected, triggering the relay contact to close and sounding the alarm.

Key Features:

  • Designed to warn of decreasing water levels in your radiator.
  • Versatile application: Choose from various models for rising water level alerts or container level control.
  • Alarm output via normally open relay contacts, rated for 12/24VDC 1.5 Amp resistive loads.
  • Built-in “slosh” delay of approximately 7 seconds prevents false alarms during vehicle movement.
  • Suitable for a wide range of vehicles, including passenger cars, trucks, buses, and agricultural equipment.
  • Ideal for monitoring coolant levels in commercial, industrial, and marine engines.
  • Ensures you never run out of drinking water on long-range 4WD adventures or in caravans.
  • Enables precise dewatering pump control between high and low levels (requires two units).

Specsheet: Download PDF
Instruction Manual: Download PDF

** ALARM ** The WL601 water level alarm is designed to give an alarm output when the level in an automotive radiator falls below a predetermined level. The unit operates by measuring a resistance to ground through the water in the radiator, and using this reading to hold the relay contact open. If radiator level drops below the probe, this is read as a high resistance and the relay contact is closed, giving an alarm output to ground. This module is designed to alarm on falling water level. Other units are available to switch on, or alarm, on rising water level or to control the level in a container between two probes.


Ratio Switch Settings

Specsheet: Download PDF
Instruction Manual: Download PDF


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Bolec Electronics

Founded in 1978, Bolec Electronics has developed a portfolio of over 80 products and a reputation that survive and thrive in some of Australia's harshest environments. Bolec Electronics is the OE supplier to some of the world's largest truck and engine manufactures.

Premium quality

Easy to install


Designed and made in Australia