Mars MAG1YL Magnetic Thermostat Test Lead Jumper 20in

Product Description

The MARS MAG1YL is a magnetic thermostat test lead jumper designed for low-voltage diagnostics in HVAC and building control systems. Rated at 30 volts AC/DC and 5 amps, this 20-inch yellow jumper allows technicians to quickly bridge terminals during troubleshooting without the need for alligator clips or manual probes. The magnetic tip design secures the lead to recessed terminals, keeping both hands free while testing circuit continuity, verifying 24-volt control signals, or isolating faults across thermostats, control boards, and related low-voltage components. It is a standard diagnostic tool carried by HVAC service technicians.

The MAG1YL is suited for residential and light commercial HVAC service work where low-voltage control circuits require isolation and testing. Typical applications include jumping thermostat terminals to test furnace sequencing, air handler operation, or cooling calls at the air conditioning unit. The magnetic tip makes it especially practical at recessed terminal strips found on control boards and alarm panels where standard clip leads lose contact. Compatible applications listed include thermostats, control boards, sensors, switches, and alarm panels.

Key Features

• Magnetic tip design seats firmly on recessed terminals without slipping
• Rated 30 volts AC/DC and 5 amps for safe use on standard low-voltage HVAC control circuits
• 20-inch length provides reach across most service panels and terminal boards
• Yellow color coding aids in lead identification during multi-point diagnostics
• Ideal for jumping thermostat terminals to isolate control circuit faults

Compatibility

Designed for use with thermostats, control boards, sensors, switches, and alarm panels in low-voltage HVAC and building control applications.

Installation Notes

This test lead is used by licensed HVAC technicians during diagnostic service calls and does not require permanent installation. Before applying the jumper, verify the circuit voltage does not exceed the 30-volt AC/DC rating. Use only on de-energized terminals when the system or component being tested requires power-down before contact. Remove the jumper and restore all original wiring and terminal connections before returning the system to normal operation.

Technical Specifications

• Length: 20 inches
• Voltage Rating: 30 volts AC/DC
• Amperage Rating: 5 amps
• Color: Yellow
• Tip Type: Magnetic
• Application: Thermostat, Control Board, Sensor, Switch, Alarm Panel

Standard Information

• Brand: MARS
• Manufacturer Part Number: MAG1YL