Testing Thunderbolt V Ignition System
Check to ensure that tachometer
GRY lead is not shorted to
ground (–) at the tachometer or
within the harness.
No Spark
Check all Terminal Connections
at Distributor, Ignition Module
and Ignition Coil.
Battery OK?
Distributor Clamping Screw
Tight?
No Spark
Check Engine
and Instrument
Wiring Harness,
Battery Cables,
Key Switch
With Key in RUN Position,
Check for 12 Volts at Positive
0
Volts
(+) Term12inal oVoltsn Ignition Coil
Unplug WHT/
RED bullet connector
from Distributor.
Check for 12 volts
on lead coming
0
Volts
from module.
12
Volts
Reconnect WHT/RED
bullet connectors.
Remove High-Tension Lead
from Distributor to Coil. Insert
a Spark Gap Tester from Coil
Tower to Ground. Disconnect
WHT/GRN Lead from Distribu-
tor. Place Ignition Key in RUN
Position. Rapidly strike the Ter-
minal of the WHT/GRN Lead
that comes from module,
Replace Ignition
Sensor in
Distributor
Spark
at Coil
against Ground (–).
(See “IMPORTANT” below)
No Spark at Coil
Substitute a New Ignition
Coil. Repeat Above Test
Spark
at Coil
Install New
Ignition Coil
No Spark at Coil
Replace Ignition Module
IMPORTANT: The WHT/GRN lead must be touched against ground (–) 2-3 times per second
to simulate a running engine. Repeat this test several times to ensure that spark is present.
Index
90-823224--2 796
TROUBLESHOOTING - 1C-9
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
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