Recently purchased a 1975 Cordoba with 47K miles in good shape somewhat. Test drove it a few times with hesitancy on acceleration thinking its a gummed up carburetor. Parked it and next day it will not start. I'm trying to learn about the ignition electronics. No spark from the secondary -coil wire. Put a new ballast resistor, new electronic module, and new voltage regulator on it. Bought a new electronic coil pickup to replace. Before I do that I want to know how to test the pickup without taking the distributor out of the car. Do I do an Ohms test on the 2 wires connected to the distributor and have someone crank the motor to see if there is a change with resistance; and if so, how many Ohms would tell me its good or bad. I read doing a coil test with resistance of 8000 Ohms on the primary and I think it was 18,000 Ohms on the secondary. Could the coil still be bad, and how do I test the primary regarding voltage. Again, I'm new to this electronic testing. Thanks. Don.