Test 12 - Breaker Point Resistance - Craftsman 161.210400 Owner's Manual

Page 20
Test Number 12--Breaker Point Resistance
NOTE; This test does not apply to Electronic ignition systems.
NOTE: Remove the distributor cap before testing and inspect the contact
points. If they are blued, blackened, or noticeably pitted, they should
be replaced. Normal, used contact points are light gray In color.
i. Place the Function Selector Switch in the POINTS position. ,
Z. Disable engine to prevent starting by removing coil secondary lead
from distributor and connect to a good engine ground with Jumper lead
as illustrated below.
#
3. Have an assistant turn the ignition switch to the START position momentarily
to crank engine slowly a little at a time until the points are closed
as indicated by the lowest meter reading.
4. Points are in GOOD condition if the reading is .3 volts or less. Replace
points if the reading is out of the good zone, or over .3 volts.
5. If the reading still exceeds .3 volts, check the distributor ground
plate, (plate on which points are mounted), pigtail extension
to primary lead inside distributor or primary lead to coil for breaks,
or misaligned point contacts on points. Refer to your vehicle service
manual for other tests relating to the Breaker Point Circuit.
6. When new points are installed, always clean and lubricate cam,
check again for contact alignment, and resistance, Adjust to
correct Dwell before startlng--See Test Number I 3, Dwell Adjustment.
7. Correct the defect and repeat the test. When the points check OK,
turn the ignition switch OFF. Reinstall the high tension lead in
the center of the distributor cap.
FIGURE 21
SECONDARY COIL CONNECTIONS
TO PREVENT ENGINE STARTING
BLACK
CLIP
GREEN
CLIP
DIST.
TO GROUND
ON ENGINE
PRIMARY LEAD
GROUND
ON
ENGINE