TROUBLESHOOTING PROCEDURES - CONTINUED
Table 2. Electrical Troubleshooting Procedures - Continued.
TEST OR INSPECTION
Backup Alarm Does Not Work.
Remove all jewelry such as rings, dog tags and bracelets. If jewelry
contacts electrical connection, a direct short may occur resulting in
injury or death and damage to equipment.
1. Check for power to backup alarm 1. If 24 to 28 Vdc are not measured
sending unit. Remove nine
at terminal 1 and BACKUP
screws and washers remove panel
ALARM fuse is good, turn engine
from operator station. Turn
start switch to OFF position and
battery disconnect switch on. Set
battery disconnect switch OFF
multimeter to measure Vdc.
(TM 5-3895-379-10). Repair or
Touch positive (+) probe of
replace wiring and connectors to
BACKUP ALARM fuse holder
121-YL) and negative (-) probe of
2. If 24 to 28 Vdc are measured at
terminal 1, go to Step 2.
2. Connect a jumper wire across 1. If backup alarm sounds, turn
terminal 1 (wire 121-YL) and
battery disconnect switch off.
terminal 2 (wire 321-BR).
Replace backup alarm sending
2. If backup alarm does not sound, go
to Step 3.