Johnson J10RSUR

94
IGNITION
IGNITION SYSTEM TESTS
Power Pack Cranking Output
Twist and remove primary leads from ignition
coils.
Connect number 1 ignition coil primary lead to
Stevens Number PL-88 Pack Load Adapter,
P/N 507983, red lead. Connect adapter black lead
to a clean engine ground.
If Stevens Number PL-88 is not available, make
an adapter using a 10-ohm, 10-watt resistor,
Radio Shack Number 271-132, or equivalent.
Connect peak-reading voltmeter red lead to
adapter red lead and meter black lead to a clean
engine ground.
Adjust voltmeter to settings listed in following
chart. Crank engine and observe meter. Meter
must show at least:
After testing number 1 ignition coil primary lead,
test the number 2 ignition coil primary lead.
• If both primary leads have good output, test
ignition coils. Refer to Ignition Coil Tests on
p. 95.
• If one primary lead has no output, replace
power pack.
• If both primary leads have no output, go to
Charge Coil Test on p. 91. If charge coil tests
good, replace the power pack.
Power Pack Running Output
Twist and remove primary leads from ignition
coils.
Use a clockwise twist to install Stevens Number
TS-77 terminal extenders, or equivalent, to igni-
tion coil primary posts.
Install primary leads on terminal extenders.
Observe proper wire routing. Orange/blue primary
lead must be connected to number 1 ignition coil.
IMPORTANT: Route all tester leads so they do
not interfere with moving engine parts.
Connect peak-reading voltmeter red lead to num-
ber 1 terminal extender. Connect meter black lead
to a clean engine ground.
Adjust voltmeter to setting listed in following chart.
Start engine and run it under load at RPM where
ignition problem exists. Meter must show at least:
After testing number 1 ignition coil, test the num-
ber 2 ignition coil.
• If either cylinder shows less than specified out-
put, test charge coil. Refer to Charge Coil Test
on p. 91.
• If charge coil tests good, replace the power
pack.
1. Load adapter DR4052
Model Voltmeter Output
9.9/15 NEG/500 175 V
1
1. Terminal extender DR4053
Model Voltmeter Output
9.9/ 15 NEG/500 200 V
≥ 200 V
1