Ignition Coil - Mercury 305 CID Service Manual

Ignition Coil

NOTICE
Refer to "Service Precautions," in "Repair
Procedures," BEFORE proceeding.
REMOVAL
1. Disconnect wire harness connectors at coil.
a - Wire Harness Connection
b - High Tension Coil Lead Connection
2. Remove high tension coil lead.
3. Remove coil bracket fasteners and remove coil
bracket with coil.
Index
5E-180 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
b
a
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RESISTANCE CHECK
Use an ohmmeter or the ohms function of a DVM for
the following check.
1. Connect meter as shown with meter 1 in the fig-
ure below.
2. Setting the meter to its highest ohms scale, check
resistance. The reading should indicate infinite
resistance. If it does not, replace the coil.
3. Connect meter as shown with meter 2 in the fig-
ure above.
4. Setting the meter to its lowest ohms scale, check
resistance. The reading should be very low or
zero resistance. If it is not, replace the coil.
5. Connect meter as shown with meter 3 in the fig-
ure above.
6. Setting the meter to its highest ohms scale, check
resistance. The reading should not indicate infi-
nite resistance. If it does, replace the coil.
INSTALLATION
1. Install coil bracket with coil to engine bracket us-
ing fasteners.
3
2
1
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