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When I did the restoration on my 73 240Z I purchased a Pertronix ignition to replace the points system. I had problems with it at the time, so I decided to go back to the points system temporarily until I got everything lined out. Got the car up and running late last year and everything seem fine. After setting all winter with only occasional starts, I started having starting problems. To make a long story short (after much frustration) I decided to try to go back and install the Pertronix system. I wanted to be sure it was functioning properly before injecting another problem into my already frustrating situation. So, I called Pertronix to see if there was any way to check the module out before installing it or buying a new one. The tech guy at Pertronix was most helpful and walked me thru a test procedure. I thought I'd pass it on. The test can be accomplished with the module on or off the car. I found it easier to do it on the bench using a 12V motorcycle battery I keep around for testing purposes. You will need a long piece of 14 or 16 ga wire with an allegator clip on each end, a 12V source, and a digital volt meter. Take the wire w/ allegator clips, attach one end to the module mounting bracket; connect the other end to the negative battery post. Set the meter to volts DC. Connect the black meter lead to black wire coming from the Pertronix ignition module Connect the red meter lead, and the red module wire then to the positive battery terminal. Your meter should read 12V. If it does not, recheck your wiring, if it's correct and you're still not reading 12V, Module is bad. If you have 12V, continue the test by passing the magnetic ring pass the ignition module. (use the same orientation of the ring to the module as if it were in the distributor). Watch the meter, each time the magnetic ring passes by the module, the voltage should drop to around one volt or so . If it does, the module is good; if it stays at 12v when passing by, the module is shot. Mine was. I ran this test again when I got the new module and verified the procedure. It worked as described. CAUTION!! DO NOT LEAVE THIS CONNECTED FOR A LONG PERIOD OF TIME OR YOU WILL BURN UP THE MODULE On a related note; you may have seen post cautioning you that if you leave the ignition on without the engine running you will burn up the Pertronix module. This is true and I think this may have happened with my first module. I asked the tech about this and he confirmed it was true. I asked how long it would take to burn up. He said about 2 MINUTES! This does not apply if the car ignition is in the Accessory position.