Meter Madness
This meter setting is used to measure battery voltage.
What is DC Volts?
1
Not a fuse
This side of the circuit provides the return path to the battery.
What is the ground side?
This law states that voltage equals current multiplied by resistance.
What is Ohm's Law?
Fuse
This is the state a circuit or component must be in to measure resistance.
What is Isolated or Disconnected?
2
Blown Fuse
Corrosion at a ground connection typically causes this electrical condition
What is high resistance?
If a circuit has 12 volts and 4 ohms of resistance, this is the current flow.
What is 3 amps?
2
Relay
A technician places the meter leads across a fuse and reads 0.02 volts with the circuit loaded. This indicates the fuse is likely this.
What is good?
3
What is a poor ground connection?
During a voltage drop test, a technician measures 2.0 volts between the battery negative terminal and an engine block ground. This indicates the ground circuit is this.
What is bad (or has excessive resistance)?
Three resistors in series each have 2 ohms of resistance. The total circuit resistance is this.
What is 6 ohms?
3
Resistor
If your meter display shows "OL" while checking a wire for continuity, the wire is likely this.
What is open?
4
Corroded ground,
A headlight is dim, and battery voltage at the bulb is correct. The next test should be this.
What is a voltage drop test.
A fuel injector draws 1 amp on a 12-volt circuit. Calculate the injector's resistance.
What is 12 ohms?
4
Ground strap
A battery measures 12.6 volts. At the fuel pump connector, only 10.2 volts is available while the pump is running. This test suggests excessive resistance in the circuit causing this.
What is voltage drop?
5
Rodent damage.
This is often a cause of intermittent electrical issues, often after a major repair.
What is a loose ground?
Double Jeopardy!!!
If 12 volt circuit has four 10 ohm resistors in parallel. This is the current flow.
5
Fuse link