JLG X23J - X700AJ Service Manual - Manual (Page 269)

SECTION 3 - CHASSIS & TURNTABLE
3-242 – JLG Lift – 3121448
RECTIFIER/REGULATOR RECTIFIER
Measure the resistance between the terminals.
• Use a tester that is equivalent to or higher than the per-
formance specified:
Internal resistance: 20 Ω/VDC, 9 Ω/VAC
• Be careful not to touch the metallic part of the tester
probe with your fingers, otherwise correct resistance
value cannot be obtained.
• Read the tester manufacturer's operation instructions
carefully before operating the tester. Follow the instruc-
tions of the Service manual. Be sure the tester's battery
is fully charged and check the meter before using the
tester.
• Use the R x 1 scale of a commercially available millime-
ter that meter shows current flow from negative (-) to
positive (+). If the meter shows current flow in one
direction but not the other, the diode is goad.
FUSE
1. Check for. a blown fuse; replace if necessary.
2. If the replaced fuse blows out, check the following.
30A FUSE:
a. Check the combination switch.
b. Check the wire harness connecting the combi-
nation switch and ECM (Bl/Y) for open or short
circuit.
c. Check the rectifier or regulator rectifier.
3A FUSE:
d. Check the combination switch.
e. Check the wire harness connecting the combi-
nation swatch and ECM (BI/Y) for open or short
circuit.