JUNCTION
BOX
TM 9-4940-568-20
2-193
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 3.
Loosen four screws and clamps and open crane junction box cover and check for
voltage between left side of terminal strip position six and a known good ground.
If voltage is present, repair or replace white wire from terminal strip to boom light
wire spool connector behind access plate. Refer to paragraph 3-16 in this manual.
If no voltage is found, go to Test 4.
Test 4.
Check for voltage between right side of terminal strip position 1 and a known good
ground.
If voltage is present, replace switch. Refer to paragraph 5-4 in this manual.
If no voltage is present, go to Test 5.
Test 5.
Disconnect crane main power harness at the crane manifold and check for 24 VDC on
pin A.
If voltage is present, repair or replace harness from crane manifold to crane
junction box. Refer to paragraph 5-4 in this manual.
If no voltage is found, go to troubleshooting FRS 24 VDC electrical system.
