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Mercury

Two Cylinder Engines 1974-1985 (With the 336-3962 or 336-3996 Stator/Switch Box) WARNING!! DO NOT START AND RUN THIS ENGINE ON A FLUSHING ATTACHMENT OR EAR MUFFS AND ACTIVATE THE STOP CIRCUIT. This system operates with the orange stop wire normally shorted to ground. When you activate the stop circuit, you open the orange’s connection to ground. The resulting backlash into the stator may damage the electronics. You must use the choke to stop the engine. In the water, the back pressure from the exhaust will slow the engine quickly enough to prevent damage to the stator.

Note: The insulator blocks used with this stator are very important. You are strongly advised to closely inspect the points wires and insulator blocks for cracking or arcing. This system operates at a much higher voltage than the normal systems and what would be acceptable on other systems will cause arcing problems.

NO SPARK ON ANY CYLINDER:

  • 1.

    Disconnect the Orange stop wire and retest. If the ignition system now has spark, the stop circuit has a problem.

  • 2.

    Use a jumper wire and short the orange (Salmon) wire to ground. If the engine now has spark, replace the stop switch.

  • 3.

    Disconnect the points wires from the ignition coils and connect a jumper wire to the negative side of the coils. Crank the engine and carefully tap the jumper to engine ground, if the coil sparks – check the points and points wires. If it fails to spark, inspect the ignition coil. You should have either a red, orange or green coil with a bare braided ground wire coming out of the backside of the coil. This bare braided ground wire MUST be connected to a clean engine ground. You cannot use a black or blue ignition coil.

NO SPARK ON ONE CYLINDER:

  • 1.

    Disconnect the points wires from the ignition coils and swap them for a cranking test. Crank the engine over and see if the spark moves to a different coil. If it does, you have a problem in the points, points wire or insulator block for the cylinder not sparking.

  • 2.

    If the spark remains on the same coil when you swap the points wires and it is the coil where the green wire is coming from the stator, remove the green jumper wire. Swap the green wire coming from the stator from one coil to the other coil. If the spark moves to the other coil, replace the green jumper wire connecting the two coils.

  • 3.

    Check the ignition coil. You should have approximately 1,000 (1 K ohm) of resistance from the spark plug wire to engine ground.

  • 4.

    Inspect the ignition coils. You should have either a red, orange or green coil with a bare braided ground wire coming out of the backside of the coil. This bare braided ground wire MUST be connected to a clean engine ground. You cannot use a black or blue ignition coil.

Green Jumper Wire (High Voltage)

Brown wire

White wire

from Points

from points

Orange or Salmon Wire (Stop Wire)

Must be grounded thru the stop switch to run on two cylinder engine (opens the ground path to stop engine).

Connect to engine ground for a one cylinder engine

Engine ground

47

Mercury Troubleshooting

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