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ignition coil
I keep burning up ignition coils. they get hot and crack and the fluid inside them comes out. This is a 1958 MF 65 gas engine. I notice on the coil it states to use with a primary resistance wire or external resistor. When I follow the wiring there is no resistor and the wiring looks like 14 gauge copper wire. after I replace it the tractor runs good for awhile but then starts back firing. eventually the tractor will die and I have to replace coil again. I get the coils from a massey rep and they said i need a resistor but they do not sell them. seems weird. is there a better coil i can just buy or where do i find these resistors.
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Re: ignition coil
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Re: ignition coil
Any auto parts store can fix you up, you can get them with a built in resistor. Or hang one off the side of the coil. Or you can get a big ole yellow ACCEL Super coil.
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Re: ignition coil
You definitely need to have the resistor if the tractor has a 12 volt electrical system. As stated earlier an auto parts store can sell you the resistor. You can also buy a 12 volt coil which will not require the external resistor. Most older 12 volt electrical systems used a 6 volt coil with the external resistor or calibrated length of wire to provide the voltage drop to 6 volts. When starting the engine, the resistor was by passed and 12 volts fed directly to the coil. This helped insure that a very hot spark was delivered during the starting phase. When the key was released from the cranking position the current to the coil was supplied through the resistor which dropped the voltage to the coil to 6 volts for normal running.
gordon
