EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-6 90-860074--1 FEBRUARY 2002
3. When a test light is specified, a low-power test light must be used. Do NOT use a high-
wattage test light. While a particular brand of test light is not suggested, a simple test,
as shown below, on any test light will ensure it to be safe for system circuit testing:
a. Connect an accurate ammeter (such as the high impedance digital multimeter) in
series with the test light being tested, and power the test light/ammeter circuit with
the battery.
b. If the ammeter indicates LESS than 3/10 amp current flow (.3 A or 300 mA), the test
light is SAFE to use.
c. If the ammeter indicates MORE than 3/10 amp current flow (.3 A or 300 mA), the test
light is NOT SAFE to use.
a
b
c
d-Amp meter
e-Test Light
f-12 Volt Battery
NOTE: Using a test light with 100 mA or less rating may show a faint glow when test actually
states no light.
4. When using a DVOM to perform voltage measurements, turn the ignition OFF when
connecting the DVOM to the circuitry to be tested.
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