Open Circuit Test

Tools Required:

• Rotunda Digital Volt-Ohmmeter 007-00001

In all electrical circuits, continuity must exist from the source of power (battery positive terminal B+), to the unit where the power is used, and back up to the source of power (battery negative terminal). A check at each connection in a circuit, starting at the battery, will locate an open circuit or will show that the circuit is complete.

Rotunda Digital Volt Ohmmeter 007-00001 or equivalent, or a self-powered test lamp connected at any two points of a circuit with the power removed from the circuit, will show if the circuit between the two connections is open or complete.

If the meter does not move or has a slight movement (high resistance), the circuit may have a poor connection or broken wire. If the bulb does not light, the circuit is open.

If the meter movement is great or full (low resistance), the circuit is complete. If the bulb lights, the circuit is complete.