TM 5-3800-205-23-1
TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0005 00
TROUBLESHOOTING USING MULTIMETER - CONTINUED
NOTE
A thirty (30) minute cool down time may be required before circuit breaker can be reset.
i.
Observe multimeter for an indication of more than 0.75 volts. If indication is more than 0.75 volts, problem could
be:
(1)
A tripped circuit breaker. If circuit breaker is tripped, reset circuit breaker and retest. If problem still exists,
replace circuit breaker (WP 0038 00).
(2)
A closed circuit breaker with excessive voltage drop. Replace circuit breaker (WP 0038 00).
j.
Remove test leads from test connector.
k.
Install test connector protective cap.
l.
Connect wire to upper terminal (GND Negative) on engine fuel shutoff solenoid.
Key Start Switch Voltage Test.
6.
NOTE
Tachometer will indicate zero for this test.
This test measures voltage drop across both poles of key start switch.
a.
Ensure engine is OFF.
b.
Place battery disconnect switch in ON position.
c.
Turn all accessories OFF.
d.
Remove protective cap from test connector receptacle.
e.
Select VDC on multimeter.
f.
Connect positive (red) lead from multimeter to test connector pin 1.
g.
Connect negative (black) lead from multimeter to test connector pin 6.
CAUTION
DO NOT crank starter motor for more than 30 seconds at a time. After 30 seconds, allow starter motor to
cool for at least two minutes before attempting to start engine again. Excessive heating of starter motor may
result in damage or premature starter failure.
h.
Using key start switch, crank engine and observe multimeter for an indication of more than 2.5 volts. Record indi-
cation.
i.
Place key start switch to OFF.
j.
Connect positive (red) lead from multimeter to test connector pin 1.
k.
Connect negative (black) lead from multimeter to test connector pin 8.
l.
Place key start switch to ON.
m.
Observe multimeter for an indication of more than 2.5 volts. Record indication.
n.
Remove test leads from test connector.
o.
Install test connector protective cap.
p.
A defect is present if voltage drop between either or both of these two sets of test points is more than 2.5 volts.
Replace key start switch (WP 0043 00).
0005 00-5
