- To test for voltage presence of a low voltage electrical device, such as an irrigation controller, simply attach the alligator clip to one wire and touch the metal probe end to the other by piercing the insulation.
- If the proper voltage is present, the appropriate LED(s) will glow brightly. For example, on 24V irrigation controller, the 6V, 12V and 24V LED's will glow brightly, the 48V LED will glow dimly. This is because most 24V transformers actually put out approximately 26-28V AC. Similarity on a 12V lighting system, only the 6V and 12V LED's will glow.
- If testing a 24V solenoid valve in the field where a slight voltage loss will be expected, only the 6V, 12V and 24V LED's will glow brightly and the 48V LED will not glow at all, this indicate 24V is present. If the 6V and 12V LED's glow brightly and the 24V LED is dim, there is less than 24V present. The dimmer the 24V LED glows, the lower the voltage presence and the greater chance of a problem in the field wiring.