TM 9-2320-211-20
Section VI. TROUBLESHOOTING THE ELECTRICAL SYSTEM
2-15. General
under seven major categories as listed below (see
Paragraphs 2-15 through 2-35 information to
locate and correct problems in the electrical system,
Paragraphs
Circuit
and includes a troubleshooting chart (Table 2-4), a
d i a g r a m showing the location of the various
e l e c t r i c a l components (fig. 2-9), the use and
function of authorized test equipment, and specific
information on testing the various circuits.
Electrical circuits for this vehicle will be covered
Table 2-4. Troubleshooting--Electrical
System
Item
No.
Probable Cause
Malfunction
IGNITION SYSTEM--
Turn ignition switch on
a. Ignition switch off
1 No
spark (battery-generator
Replace the switch if required (para
b. Defective ignition switch
indicator pointer shows low or no
2-154).
reading).
Check the continuity of circuit No. 12
c. Defective
ignition
coil
or
from the ignition switch to the coil,
distributor.
and from the coil to the distributor.
If current shows from the switch to
the coil, but not from the coil to the
distributor, replace the coil (para 2-
the
distributor (para 2-122).
Inspect the breaker points. If they are
d. Distributor breaker points not
burned or pitted, replace them
opening or faulty.
(para 2-122). Adjust the point
opening (para 2-122).
Replace the capacitor (para 2-122).
e. Defective distributor capacitor.
Replace the rotor (para 2-122).
a. Defective distributor rotor.
2 No spark
(battery-generator
Clean and tighten all electrical
b. Loose electrical connections.
indicator reads normal).
connections from the starter to the
distributor.
WARNING
c. Defective spark plug cables.
In the following procedure
hold the insulated portion of
the cable. Do not touch the
terminal contact portion of
the cable while performing
the test.
Test each cable by disconnecting it
from the spark plug and holding it
3/8 inch from the cylinder head
while cranking the engine. Replace
any cable not producing good spark
Adjust the spark plug gap (para 2-
a. Spark plugs improperly set.
3 Engine misfires at high speeds.
Check the breaker point opening and
b. Distributor breaker opening
adjust it if necessary (para 2-122).
improperly set.
Inspect cables and connections. Test
c. Defective ignition coil
the coil and replace it if necessary.
Check spark plug and coil cables for
d. Defective ignition wiring
continuity. R e p l a c e t h e m i f
necessary (para 2-119 and 2-122).
