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Author Topic:   Yamaha 70-HP Charging

wayne baker posted 09-24-2008 05:00 AM ET (US)
I am trying to help a friend run down a charging problem on a 70-HP Yamaha. Checking resistance on the lighting coil it proves to be bad. If the charging coil is good and the lighting coil is bad should the motor run when the battery is dead? In other words, with a dead battery if given a jump start should the motor be able to run on the power from the charging coil to the capacitor discharge ignition (CDI)? Or does it require the battery to have a charge to fire the individual coils? By the way he changed the regulator or resistor before checking the coils.
jimh posted 09-24-2008 09:06 AM ET (US)
Having owned a pair of Yamaha 70-HP motors, and had the Lighting Coil go bad on both of them, my recollection is that the Charging Coil runs the CDI independently. I think you could pull start that motor and it would run without a battery attached.
wayne baker posted 09-24-2008 12:24 PM ET (US)
Thanks Jim. My friend found information that said the lighting coil charged the battery and was sure that was the part he needs. As I thought about it, knowing the problem is that the boat will run until the battery is drained, I am not sure the lighting coil is the only problem.

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Author	Topic: Yamaha 70-HP Charging
wayne baker	posted 09-24-2008 05:00 AM ET (US) I am trying to help a friend run down a charging problem on a 70-HP Yamaha. Checking resistance on the lighting coil it proves to be bad. If the charging coil is good and the lighting coil is bad should the motor run when the battery is dead? In other words, with a dead battery if given a jump start should the motor be able to run on the power from the charging coil to the capacitor discharge ignition (CDI)? Or does it require the battery to have a charge to fire the individual coils? By the way he changed the regulator or resistor before checking the coils.
jimh	posted 09-24-2008 09:06 AM ET (US) Having owned a pair of Yamaha 70-HP motors, and had the Lighting Coil go bad on both of them, my recollection is that the Charging Coil runs the CDI independently. I think you could pull start that motor and it would run without a battery attached.
wayne baker	posted 09-24-2008 12:24 PM ET (US) Thanks Jim. My friend found information that said the lighting coil charged the battery and was sure that was the part he needs. As I thought about it, knowing the problem is that the boat will run until the battery is drained, I am not sure the lighting coil is the only problem.