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IV. ENGINE
57
Ignition coil
l. Chek the continuity of the primary coil.
Check for continuity between the two terminals of each
primary winding with a radio tester. (Blackfwhite lead wire
and yellow or blue lead wire)
2. Check the continuity of the secondary coil.
.
Check for continuity between the two terminals of each
secondary coil.
If there is no continuity, the coil has an open-circuit and
must be replaced.
3. Check the ignition coil far performance.
The coil may sometimes deteriorate in such a way as to
produce weak spark at the spark plug gap. This can be
checked by the service tester as follows:
Connect the tester power supply cable to the positive and
negative terrninals of the fully charged 12V battery. Make
the connections of the tester following the instructions
furnished by the tester manufacturer.
Measure the maximum distance where spark jumps across
the gap regularly.
Fig. 4-117
Checking ignition coi! performance
NOTE:
Reverse the polarity of the spark plug cables if spark occurs
as "B" in Fig. 4-118. Sketch "A" shows the norma! test
condition.
A
r
Fig. 4-118
3-point spark tester
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