DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Chart A-7 (3 of 6): Ignition System Check
DIAGNOSTIC AIDS:
An intermittent may be caused by a poor connection, rubbed through wire insulation or a
wire broken inside the insulation. Check for the following items:
•
•
Poor connection or damaged harness. Inspect the ECM harness and connectors for
improper mating, broken locks, improperly formed or damaged terminals, poor termi-
nal to wire connection, and damaged harness
The “tach” needs to be disconnected while testing the ignition system. You will also
need a place to check coil trigger voltage. By disconnecting the 5-way or 6-way har-
ness connector, you will get test terminals to check coil trigger voltage as needed in
several steps. After “tach” is disconnected, try starting the engine. If the engine
starts, check for a short to ground in the boat tach circuit.
•
Check all terminal connections at distributor, ignition module, and ignition coil. Is the
battery OK? Is the distributor clamping screw tight?
Index
Page 5G-40
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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