Posted by Steve@Advance on October 21, 2018 at 13:34:06 from (66.169.147.211):
In Reply to: good then weak spark posted by pinball on October 21, 2018 at 08:17:53:
Do you have a volt/ohm meter?
Check the ohms across the coil, out of circuit. If 1.5 ohms, it needs a resistor. If 3 ohms it does not need a resistor.
Go by the readings, not what was on the box or the part number unless it is clearly labeled on the coil itself. Many times coils get reboxed, shuffled from store to store, as they are no longer a fast moving item.
Next check the voltage at the ignition switch side of the resistor. It should be near battery voltage, switch on or cranking. If it drops below around 9 volts while cranking, there is not enough left to make a good spark. If the engine spins normally could be a bad ignition switch or high resistance connection between the switch and the resistor. If the engine is turning slowly, could be low battery, bad connection, bad starter, too small battery cables.
If that all checks good, move the volt meter to the - side of the coil. with the ignition on, the points open, should have battery voltage to ground. With points closed should have zero volts to ground. If the points are closed, and have any voltage at the coil - terminal, the points are not making connection, or a bad connection from the coil to the points, or the distributor is loose and lost it's ground.
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