Group 30 Electrical System—VNL, VNM
Tools
Tools
Special Equipment
The following items can be ordered from the vendors listed.
Digital Multimeter (DMM)
A Digital Multimeter (DMM) is one of the most important
tools available for electrical troubleshooting. A multimeter
such as a Fluke 87 is recommended for troubleshooting.
It provides diagnostic capabilities such as current (amper-
age), resistance and voltage tests, as well as specialized
features for automotive troubleshooting. Any circuit can
be tested for continuity or short circuits with a low-reading
voltmeter.
CAUTION
Never use the ohmmeter mode in a powered circuit, or
as a substitute for a voltmeter or ammeter, as damage
to the instrument will result. Use the ohmmeter mode
only when power is removed from the circuit.
When using a multimeter and the value being tested is
unknown, always use the highest scale first and work
down to a mid-scale reading whenever possible. This will
avoid damage to the instrument.
Before using the DMM to measure resistance, check its
calibration by touching the leads together. If there is a
reading other than zero, subtract it from measurements
made with the DMM.
The following tests can be performed with a DMM:
•
Current (amperage) check
•
Voltage check
•
Resistance check
•
Diode check
W2001014
Fluke 87 Digital Multimeter
Available from Volvo (P/N 9510060)
or available from your local Fluke dealer
Anti-Static Wrist Strap
A wrist grounding strap must be worn when working on
electronic equipment such as the instrument cluster. This
is to prevent electrostatic discharge (ESD), which can
damage electronic components. To use the wrist strap in
a vehicle, attach the alligator clip to the nearest electrical
ground such as a ground terminal or preferably a ground
stud.
W3000572
Anti-Static Wrist Strap
Available from Kent-Moore (P/N BT-8639-B)
Call 1-800-328-6657
7
