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Author Topic:   1987 Mercury 175: No Spark
EricScott posted 08-04-2008 10:39 PM ET (US)   Profile for EricScott   Send Email to EricScott  
I have a [1987 Mercury 175-HP motor]. Black smoke came from [unrecognized] cover and then [the 1987 Mercury 175-HP motor] would turn over and not start. I [checked the lanyard for the] kill switch. I pulled plugs--no spark at plugs. Any help to switch box or stator will help Eric
jimh posted 08-05-2008 08:42 AM ET (US)     Profile for jimh  Send Email to jimh     
If all cylinders lack spark, look for an electrical component in the ignition system which is common to all. One some Mercury motors each bank has its own capacitor discharge ignition system--"switchbox" in Mercury lingo, I believe. If all cylinders are missing spark, the ignition primary winding of the stator is suspect.

Also, check the KILL circuit. It has rather high voltage on the wire and the insulation has been known to break down, shorting the circuit to ground and killing the spark. Locate the KILL circuit conductor and temporarily disconnect it at the engine; then test for spark.

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