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I have a 1991 Yamaha 250 outboard motor. I can connect the harness from the control box to the motor harness, put the motor in nuetral, and the motor will turn over but it will not start. I can disconnect the conrol box from the motor, jump it direct from the battery, and it will start. What might be the problem? I even bought a new control box but still have the same problem. Thank you, Dean Youngstrand

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  • deancy Oct 16, 2010

    There is power from the ignition switch because when hooked up it will turn motor over. There is no spark from the coils. However when I disconnect the control box and jump the motor direct from the battery the motor will start.

    Dean

  • deancy Oct 16, 2010

    This is a brand new control box. The control box I had hooked up before did the same thing?

    Dean

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I would check for power coming off of the ignition switch. The ignition switch is what sends power to the control box to the coil. You can also check for power on your coil. But I would bet that it is your ignition switch.

Posted on Oct 16, 2010

  • Rodney Clark
    Rodney Clark Oct 16, 2010

    Yes. The ignition switch is not sending power to the coils. There is a separate wire that goes from the ignition switch to the coils.

  • Rodney Clark
    Rodney Clark Oct 16, 2010

    The control box is where your key is at? Turn on the key and check the coil for power. If you have no power then the power wire from the control box to the coil is broken or loose somewhere.

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