Check spark with a WIRE coil wire and test gap, NOT a resistor wire. Should get a nice hot "snap" at least 3/8 and more typically 1/2" long
CAVEAT!!..........If you are checking spark by jumpering the starter relay and not using the key, you are going through the ballast and not getting the higher coil voltage from the ignition switch--bypass circuit. You should get a stronger spark WHEN USING THE KEY to crank