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Old 08-13-2012, 02:16 PM
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Dangerous Doug Dangerous Doug is offline
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Join Date: Apr 2004
Location: Scotts Valley, CA
Cobra Make, Engine: ERA 289 FIA #2108
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Quote:
Originally Posted by Mongoose930 View Post
Per the MSD Tech Line for the Blaster 2 Coil:

The primary resistance, measured from the coil pos. stud and the coil neg. stud should be .7 Ohms. That is 7/10 of an ohm +/- 10%.

The secondary of the coil measured between coil pos. stud and the center tower (where the coil wire clips on) would read 4.7K Ohms. That is 4.7 thousand ohms (4,700 ohms) +/- 10 %.
The difficulty I could see with this test is finding the failure in the coil before it cools enough to open the short (or close the open, whichever failure mechanism is occuring). Coils that I've had fail were intermittent failures, and the primary variable was heat.

After I had (incorrectly) determined the coil had failed, I shut the hood, put my DMM back in the tool box and put the toolbox onto my passenger floor, climbed in, buckled, and then the engine fired right up. Not much more than a few minutes, if that.

One site I looked at last night used a spark plug fed directly from the coil tower with a grounded base to see if there is enough spark. Sounds...shocking...

DD
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