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Re: coil test
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Posted by Stephen B [Email] (more from Stephen B) on Tue, 16 Aug 2011 00:15:01 Share Post by Email
In Reply to: Re: coil test, Stephen b, Tue, 16 Aug 2011 00:05:42
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Me again
I found this on the web, it alligns with what i saw when testing mine

http://mgaguru.com/mgtech/ignition/ig108.htm

For preliminary test, use an ohm meter to check the resistance of the windings of the coil. For a non-ballasted ignition system like the MGA, coil primary resistance should be about 3.2 ohms. A high energy coil may have slightly lower primary resistance. A coil for use with a ballasted type ignition system (such as late model MGB) will have about half as much primary resistance, around 1.6 ohms. Resistance for the secondary winding will be very high, something like 10,000 ohms. Check that circuit resistance between the HT output and one of the primary input terminals.

To test the ignition coil function you will need a battery, a few wires, and a capacitor (about 0.01 mF value). Connect battery power to the coil. Mount the capacitor physically to a grounding point (return to battery opposite the power terminal), and connect the capacitor wire to the other side of the coil (terminal opposite the power input terminal). Connect a jumper wire to the coil along with the capacitor connection.

Touch jumper wire to ground (the capacitor mounting point) to complete the coil primary circuit. When you disconnect the jumper from ground, and you should get a nice spark from the coil. Touch jumper to ground, then pull away to make spark. Hold the coil output high tension wire near a grounding point to see how far the spark jumps. Spark should jump more than 1/4 inch in open air.



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