Polarity Testing; Continuity Testing - Forch 5439 172 Manual Del Usuario

red = positive
green = continuity
No Continuity

Polarity testing

Contacting the Testing Device's tip to a POSITIVE (+)
circuit will light the LED indicator RED.
Contacting the Testing Device's tip to a NEGATIVE (-)
circuit will light the LED indicator GREEN.
Contacting the Testing Device's tip to an OPEN circuit
will be indicated by the LED indicator not lighting.
green = negative

Continuity testing

By using the Testing Device's tip together with auxiliary
ground test lead, continuity can be tested on wires and
components that are disconnected from the vehicle's
electrical system.
When continuity is present, the LED indicator will light
GREEN.
Continuity