Voltmeter - How to
Voltmeter Set to DC Voltage Step 2 - Grasp both negative and positive leads and hold them against the desired test point such as a terminal or wire, the meter will instantly give a reading.
Voltmeter Test Leads
Voltmeter Alternator Test Step 4 - Switching the meter over to ohms will test the internal winding circuit of any electronically controlled device such as a relay, sensor, fuel injector or motor.
Set Meter to Ohms Step 5 - If high resistance or an open circuit is present the unit has failed. Switch the meter to mV to test milli volt generation from a sensor, such as a crank angle sensor while the engine is cranking over.
Test Fuel Injector Step 6 - A voltmeter works great for testing pulse voltage which is needed for fuel injectors and ignition coils.
Testing Ignition Coil Pulse Step 7 - Gently install a paper clip into the connector to aid in testing when needed. If a sharp probe is used to pierce the wire for testing, use electrical tape to reseal the area. (Note: Do not damage terminals.)
Installing Paper Clip Helpful Information A digital voltmeter is ideal for home and shop use for troubleshooting and locating faulty wiring. A digital voltmeter can be used to check for good continuity of an electrical circuit by using the ohms of resistance feature. To check for power at a particular electrical circuit, locate a good clean ground before testing begins. Digital Voltmeter Function Range
- DC Voltage 200mV to 1000V
- AC Voltage 200mV to 750V
- DC Current 200A to 10A
- Ohms200 to 2M
- Diode Check
- Transistor Check