Disconnect all wires from the coil. Use a DVOM (Digital Volt Ohm Meter) to test the coil. Connect one meter lead (either one) to one of the small primary terminals on the coil and the other meter lead to the other primary terminal. Set the meter's function switch to OHMS, R x 1. You should read between 2 -3 ohms. Any higher or lower, the coil is probably bad.
Now, you may can remove the spark plug wires from the plugs and insert another set of plugs in the wires. Make sure the plugs are grounded on the heads. Turn the switch on and turn it back off. When you turn the switch back off, you should see a single spark at the plugs.
Good Luck
Steve
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These details will help.
Thanks.
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