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TM 10-3930-643-20
ELECTRICAL SYSTEM TROUBLESHOOTING AND MAINTENANCE.
5-8.
Instrument Panel Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
o. HOURMETER DOES NOT OPERATE.
NOTE
Before proceeding with continuity tests, refer to paragraph 2-13 for
i n i t i a l s e t u p i n s t r u c t i o n s.
Step 1.
Test the continuity of
assembly at Connectors
to both connectors.
the hourmeter gage.
Disconnect harness
A and B, as shown.
Connect
multimeter
If the multimeter needle does not move, the circuit does not have
continuity. Replace hourmeter, refer to paragraph 5-14.
Step 2. Test the continuity of the wire assembly. Disconnect Terminal
E from circuit breaker, as shown.
Connect
m u l t i m e t e r to
Connector C and Terminal E.
If the multimeter needle
c o n t i n u i t y.
Identify as
Support.
Step 3.
Test the continuity
instrument panel harness from the intermediate harness, as
shown. Connect multimeter to Connector D and Pin A.
does not move, the circuit does not have
a defective
wire
and
c o n t a c t D i r e ct
of the wire assembly.
D i s c o n n e c t t he
If the multimeter needle does not move, the circuit does not have
c o n t i n u i t y . I d e n t i f y a s a d e f e c t i v e w i r e a n d c o n t a c t D i r e ct
Support.
5-63
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