wallifishrmn

Can someone tell me what readings you should get when testing a TI ignition coil from a 1971 LT-1 corvette. Need readings for the primary and secondary coil.

Thank You

69427

Keep in mind that measuring the DC resistance of an ignition coil will only give limited information. It will show if there is an open circuit, certainly, but it will not tell you if there are any "minor" shorted windings, which can cause operational problems once there is current flowing and a magnetic field is created.

Just something to keep in the back of your mind if the coil ohms-out okay, but running issues (misfire, etc) persist.

wallifishrmn

Is there a better way to check the coil besides the ohms resistance?

hugh9222

No export but I had intermittent starting issues with my 64 FI w/a K66 option for years. Reading on my problem coil were 6K ohms and .6 ohms. Replaced that non-TI coil with what I was told was a correct (and very expensive) coil that had reading of 15K and .35. That was almost 2 years ago and it has not given me a lick of problems since springing for the big buck (correct) coil. Hugh

69427

Yes and no. There are other ways that will result in better information, but those methods are done with some lab/test equipment (current measuring probe, oscilloscope, etc). That's great if you have the equipment, but most enthusiasts won't have them. Generally the only convenient option for an enthusiast is to make the DC resistance measurements (at room temperature and then hot), and then if the problem is still there do a coil swap to see if the problem remains or goes away. The difficult part with swapping out the coil is that spare TI coils are generally rare/unavailable, and swapping in a points type coil can damage the TI amplifier box.