Question about 1979 Harley Davidson XLH 1000 Sportster
Well, power only comes in from one side of the coil and if the points are closed, your meter will not read voltage on the other side. Make sure the points are open when checking for voltage.
To check the coil's primary circuit. Take all wires loose from the small terminals at either end of the coil. Using a DVOM (digital volt ohm meter), put the meter in OHMS, R times 1 scale. Connect one meter lead to each terminal of the coil, make no difference which one goes where. The meter should read between 5 and 6 ohms of resistance. If it reads "Infinite" the coil is open and if it read "Zero" the coil's primary circuit is shorted.
The easy way to test the coil is put a spark plug in the plug wire and lay it on the head. Make sure it has a good ground. Turn the engine over until the points are closed. Turn on the ignition switch and use something to open the point. Each time you open the points, you should see a spark at the plug. If not, you've probably got a bad coil.
Posted on Aug 06, 2010
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Posted on Jan 02, 2017
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