4-10.1 Cleaning and Inspection
Wipe clean exterior of alarm relay module with clean rag. Remove front plate and vacuum clean or clean inside
with electrician's brush. Avoid using unauthorized solvents for cleaning inside of alarm relay module. Solvents
leave a greasy film on components that may reduce electrical conductivity.
Visually inspect for indications of burns, corrosion, loose connections, damaged parts, or chipped paint. Clean
corrosion from contacts and terminals, tighten loose connections, and replace damaged parts. Remove
corrosion with silver polish, fine sandpaper, or burnishing tool. Do not use emery paper or emery cloth or steel
wool. Vacuum to remove residue. Touch up paint according to TB 43-0144. Do not paint threads or labels.
If bilge alarm module is inoperative, move main power switch to ON (Figure 1-3) and close (ON) circuit breaker 1
P14 on 24 Vdc power panel Check input voltage from main processor and 24 Vdc power panel. If input voltage
from main processor Is not between 25 and 28 Vdc go to step b. If input voltage from 24 Vdc power panel is not
between 25 and 28 Vdc, go to step c to check power source. If both readings are between 25 and 28 Vdc, go to
step d to check bilge alarm module
Check main processor output voltage to bilge alarm module. If voltage to bilge alarm module reading is not
between 25 and 28 Vdc, check main processor as given in paragraph 4-6. If voltage reading is between 25 and
28 Vdc, check cable 1 P14A, C3 and C4 connections and continuity. Tighten cable connection or repair or
replace bad cable between main processor and bilge alarm module.
Check 24 Vdc power panel circuit breaker 1 P14 output. If output reading is not between 25 and 28 Vdc, power
source is at fault Check power source. If output voltage is between 25 and 28 Vdc, check cable 1 P14
connections and continuity. Tighten cable connections or repair or replace bad cable between bilge alarm
module and 24 Vdc power panel
Check bilge alarm module output voltage to horn and strobe light on top of deckhouse. If voltage reading is not
25 to 28 Vdc, replace fuse as given In paragraph 4-10.3. If after repair, bilge alarm module still does not
operate, replace module as given In paragraph 4-10.4. If voltage is 25 to 28 Vdc, check horn as given in
paragraph 4-12 or strobe light as given in paragraph 4-13.
4-10.3 Repair. Repair involves replacement of fuses
Remove bilge alarm module front plate by loosening four screws.
Remove and replace 1OA fuse(s) located on center of left and right sides of circuit board.
Replace front plate.
Tag and disconnect cables (1P14, 1P14A, 1P14B, 1P14C, C3 and C4) from bilge alarm module.
Remove mounting hardware and remove module.
Install module and secure with mounting hardware.
4-11 Main power switch
Make sure main power switch (Figure 1-3) Is In OFF position and batteries are disconnected
when performing maintenance. Redtag switch with: "WARNING DO NOT ACTIVATE.
REPAIRS BEING MADE."