JLG 450A_AJ Series II Service Manual - Manual (Page 418)

SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS
7-2 – JLG Lift – 3121180
Resistance Measurement
• Test meter and leads by touching leads together.
Resistance should read a short circuit (very low
resistance).
• Circuit power must be OFF before testing resistance.
• Disconnect component from circuit before testing.
• If meter is not auto ranging, set it to correct range
(See multimeter’s operation manual).
• Use firm contact with meter leads.
Continuity Measurement
• Some meters require a separate button press to
enable audible continuity testing.
• Circuit power must be OFF before testing continuity.
• Disconnect component from circuit before testing.
• Use firm contact with meter leads.
• First test meter and leads by touching leads
together. Meter should produce an audible alarm,
indicating continuity.
Figure 7-2. Resistance Measurement
Figure 7-3. Continuity Measurement