Service manual

90-898303 2-25

9) Repeat failures of the same electrical component could be caused by

other electrical components.

- If one circuit in a switch box keeps failing, it could be the result of

high resistance in the primary of a coil, primary lead between the

switch box and coil or high resistance on the coil primary ground wire.

- If same switch box keeps failing, it could be because of a random

open circuit in the trigger.

10) When testing DVA voltage at coil primary, the NEGATIVE test lead MUST

be touching the NEGATIVE terminal of the ignition coil and NOT common

ground.

11) Switch leads between components to isolate problem. Example:

- If voltage is low to 1 switch box, move the RED and BLUE stator

leads from 1 switch box to the other switch box. If voltage problem

moves, STATOR is defective. If problem does not move, SWITCH

BOX is defective.

- No spark on 1 cylinder could be ignition coil or switch box. Moving the

primary lead from 1 ignition coil to another should isolate the problem

source. If the problem follows, the SWITCH BOX is defective. If the

problem stays with the same cylinder, the IGNITION COIL is defective.

- No spark to 2 cylinders could be a switch box or trigger. Move a pair

of trigger leads from 1 switch box to another. If problem follows,

TRIGGER is defective. If problem does not follow, SWITCH BOX is

defective.

12) Trigger Voltage can be checked with a voltmeter set on the 20 VAC scale.

Place 1 voltmeter lead on the switch box trigger terminal and the other

voltmeter lead to engine ground. Voltage should be present; if not, reverse

voltmeter leads. If voltage is still not present, trigger is defective.

13) Inspect spark plug high-tension leads (especially spark plug boots) for

cuts, nicks or abraisions which can allow voltage to leak to ground.

Notes

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