ELECTRICAL
9-15
IGNITION SYSTEM TEST
Whenever troubleshooting an electrical problem you should first check all terminal connections to be sure they are clean and
tight. Also be sure that colors match when wires are connected. Use the following pages as a guide for troubleshooting. The
resistance values are also given on the specification pages.
Condition: No Spark or intermittent spark
Verify 12 Volt DC power is present on the wire to CDI. Replace Spark Plug.
Verify the CDI has a good ground (B) for operation.
Does it have spark?
NO
YES
Test the ignition switch, engine stop
switch, and speed limiter circuit for
shorts to ground.
Check connectors for moisture, wire
color matching or corrosion.
Verify that a minimum of 10.5 VDC is getting to the
CDI module during cranking. Refer to the wiring
schematic for connections and specifications.
Compare results to the specifications on
views. Are all within specifications?
NO
Inspect battery condition, connectors,
wiring and grounds to the
question. Replace the component if a
wiring problem cannot be found.
YES
Check coil ground connection between engine and
coil mount using an ohmmeter. The coil mount should
have good continuity to ground on the engine (0-.2 Ω
. 
NO
Clean coil mounting area.
Repair ground wire connections.
YES
Disconnect and check the secondary coil. Resistance
values should be:
Primary Side - Primary Wire Tab to Ground (on coil
mount or engine): .3 to .5 Ohms
Secondary Side High Tension Wire to engine
ground- Cap installed - 10,500Ω
Cap removed - 6300Ω
Are these values within specs?
NO
Replace the ignition coil.
YES
If all of the above tests are within specifications, and all grounds, connections, and wire color-coding have been
inspected, perform voltage output tests on following page or replace the CDI module.
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