My brother and his friend have this massive Bayliner Trophy they are restoring. I was trying to help them get the engine running. Its not getting spark. Its got points and a two wire coil. We tried every combination of the two mystery coil wires (one white, one purple) with jumping power to the coil. No spark detected. My brother says the points looked clean(hes not mechanic though). I don't know a whole lot about old ignitions, you know points and stuff. How do you test for the points signal? Can you do it with a test light on positive and touch the wire to see if the ground is breaking, per the flashing light?