TM 5-3825-270-23&P
0037
CONDITION/INDICATION
Is tachometer pulse adjustment dial set to pulse 5?
DECISION
No - Place tachometer pulse adjustment dial to pulse 5. Verify problem is solved. (Step 7 - Does tachometer
operate normally?)
Yes - Go to step 3. (Step 3 - Are 22 to 28 VDC present at red wire on tachometer?)
STEP 3
Are 22 to 28 VDC present at red wire on tachometer?
WARNING
Remove all jewelry such as rings, ID tags, bracelets, etc., prior to working on or around
vehicle. Jewelry and tools can catch on equipment, contact positive electrical circuits, and
cause a direct short, severe burns, or electrical shock. Failure to comply may result in injury
or death to personnel.
1.
Set multimeter to measure voltage.
2.
Rotate EMERGENCY STOP switch to on position. (TM 5-3825-270-10)
3.
Connect red multimeter probe to red wire at tachometer.
GREY
PULSE ADJUSTMENT
WIRE
DIAL
RED
WIRE
BLACK
WIRE
Figure 4. Tachometer Red Wire - Step 3.
4.
Connect black multimeter probe to known good ground.
5.
Note multimeter reading.
CONDITION/INDICATION
Are 22 to 28 VDC present at red wire on tachometer?
DECISION
No - Replace red wire from tachometer to positive terminal strip terminal. (WP 0099) Verify problem is solved.
(Step 7 - Does tachometer operate normally?)
Yes - Go to step 4. (Step 4 - Are less than 200 ohms measured on black wire from tachometer to negative
terminal strip, terminal 13.)
STEP 4
Are less than 200 ohms measured on black wire from tachometer to negative terminal strip, terminal 13.
1.
Push in EMERGENCY STOP switch to off position. (TM 5-3825-270-10)