90
IGNITION
IGNITION SYSTEM TESTS
Crank engine and observe results at spark tester.
• If there is no spark at one gap, go to Power
Pack Cranking Output on p. 94.
• If there is no spark at both gaps, go to Charge
Coil Test on p. 91.
• If the spark jumps alternately at each gap, the
problem is in the stop circuit. Begin trouble-
shooting with Ohmmeter Test and follow all
steps to locate the fault.
Ohmmeter Test
Step 1
IMPORTANT: All ohmmeter tests must be per-
formed with the engine NOT running.
Install the clip and lanyard.
Calibrate an ohmmeter on appropriate scale. Con-
nect meter leads between ignition plate end of
connector, terminal "E," and a clean engine
ground.
• The meter must show a high reading.
Momentarily press inward on the stop button.
• The meter must show a low reading.
Remove the emergency stop switch clip and lan-
yard.
• The meter must show a low reading.
• If any of the test results are incorrect, replace
the stop button assembly.
Complete all circuits disconnected during this test.
STEP 2
Install the emergency stop switch clip and lanyard.
Disconnect the 5-pin Amphenol connector
between the power pack and ignition plate.
Calibrate ohmmeter on appropriate scale. Con-
nect meter leads between ignition plate end of
connector, terminal "E," and a clean engine
ground.
• Key OFF, meter must show a low reading.
• Key ON, meter must show a high reading.
If key ON reading is low, disconnect harness
black/yellow lead from key switch "M" terminal.
• If meter now shows a high reading, replace key
switch.
• If meter shows a low reading, go to STEP 3.
STEP 3
Disconnect the key switch 6-pin connector
• If meter now shows a high reading, repair or
replace key switch harness.
• If meter shows a low reading, go to STEP 4.
STEP 4
Disconnect the engine harness to instrument har-
ness 6-pin connector that contains the black/yel-
low lead.
• If meter now shows a high reading, repair or
replace instrument harness.
• If meter shows a low reading, repair or replace
engine harness.
• If the engine fails to shut off, test for open
black/yellow lead, black/white lead, damaged
key switch, or damaged power pack.
Complete all circuits disconnected during this test.
DR4186
1. Key switch 6-pin connector
2. Instrument harness 6-pin connector
DR6224
1
2
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