- I Never Get the Slow-Blinking LED Light on the “Function” Button

Possible Causes and Fixes

1. Your turfRad sensor is not getting a GPS location signal.
There are several things to try to resolve this: 

• Make sure the GPS antenna (black square box) is firmly attached to the port labeled GPS on the sensor and pointed upwards towards the sky 
• Make sure you have a clear view of the sky; you will likely not get GPS lock in a metal-roofed maintenance facility. 
• It can take up to 10 minutes to obtain GPS lock on your first install when the sensor has moved a long distance since last obtaining a fix. 
• Check that there are no pinches or dings in the GPS antenna wire. Deformations or small breaks in this cable can compromise the low-power GPS signal. If you need a new GPS antenna, please request one from support@terraradtech.com. 

2. Insufficient Power Supply

• If the function light stays off completely, check the power source and connections.

• Ensure the sensor is connected to a reliable power output (for example, avoid USB ports on some utility vehicles, which may not deliver consistent voltage).

• For array setups, make sure each sensor receives its own power connection rather than splitting one power source. Power loss from shared or low-output connections can prevent proper operation.

Summary

In most cases, this issue is GPS-related — but an unreliable or insufficient power source can also prevent the function light from blinking. Verifying both the GPS setup and power connections usually resolves the problem quickly.