Frontier SE Crew Cab 2WD V6-3.3L (VG33E) (2002)
Measuring Voltage Drop - Accumulated Method
1. Connect the voltmeter across the connector or part of the circuit you want to check. The positive lead of the voltmeter should be closer to power
and the negative lead closer to ground.
2. Operate the circuit.
3. The voltmeter will indicate how many volts are being used to push" current through that part of the circuit.
Note in the illustration that there is an excessive 4.1 volt drop between the battery and the bulb.
Measuring Voltage Drop - Step by Step
The step by step method is most useful for isolating excessive drops in low voltage systems (such as those in Computer Controlled Systems").
Circuits in the Computer Controlled System" operate on very low amperage.
The (Computer Controlled) system operations can be adversely affected by any variation in resistance in the system. Such resistance variation may be
caused by poor connection improper installation improper wire gauge or corrosion.
The step by step voltage drop test can identify a component or wire with too much resistance.
Control Unit Circuit Test