SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-31
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Revision: July 2005 2005 Maxima
? Connect the DMM across the connector or part of the circuit you want to check. The positive lead of the
DMM should be closer to power and the negative lead closer to ground.
? Operate the circuit.
? The DMM 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.
SGI974
SAIA0258E