My father in law has 1958 ford 841 tractor. It will only start when towed in gear. We have replaced the plugs,plug wires,cap,rotor,batter(6v) and coil. It turns over great but will not fire. We have tested 6v on in and out of the coil. There is a very weak spark from the coil wire when we extract if from the distributor cap to let it arc to ground. There is practically no spark from the plugs or arcing a plug wire. Where do we look now?
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