TM 5-3800-205-23-1
TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0005 00
TROUBLESHOOTING USING MULTIMETER - CONTINUED
q.
Connect wire to upper terminal (GND Negative) on engine fuel shutoff solenoid.
7.
NOTE
This test measures voltage drop across main relay.
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 9.
g.
Connect negative (black) lead from multimeter to test connector pin 12.
h.
Place key start switch to ON.
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 1.3 volts. If indication is more than 1.3 volts, problem could be:
(1)
A tripped circuit breaker. If circuit breaker is tripped, reset circuit breaker and retest.
(2)
A closed circuit breaker with excessive voltage drop. Replace circuit breaker (WP 0038 00) and retest.
(3)
An open relay contact, a closed relay with excessive voltage drop or a relay with welded contacts. Replace
j.
Remove test leads from test connector.
k.
Install test connector protective cap.
8.
Engine Temperature Coolant Switch Voltage Test.
NOTE
Perform this test only when engine coolant temperature is below 100F (38C).
This test measures voltage drop across engine temperature 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 11.
g.
Connect negative (black) lead from multimeter to test connector pin 7.
0005 00-6