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Author Topic: Electrical DIY FAQ - Read This Second  (Read 21794 times)

Offline Sonreir

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Re: Electrical DIY FAQ - Read This Second
« Reply #10 on: May 05, 2014, 13:53:51 »
How do I test if my ignition coils are good?

In order to test if your ignition coils are working, there are several multimeter tests one can perform, but often it's a lot easier to just perform a bench test.

To test a coil on the bench, you will need three wires (preferably with alligator clips) and a charged battery (in the same voltage as your coil).

First, place your ignition coil on the bench with the spark plug wire, cap, and spark plug all attached properly to the ignition coil.

Next, take one of the wires and connect the threaded portion of the spark plug to the negative terminal of the battery.

After that, connect the negative terminal of the ignition coil to one of the wires, but leave the other end of the test wire unconnected (for the moment).

Finally, connect the positive terminal of the ignition coil to the positive terminal of the battery.

At this point, you should have almost everything you need.  With a close eye on your spark plug gap, touch the wire coming off the negative terminal of the ignition coil (the one that has been left unconnected up to this point) to the negative terminal of the battery and the pull it off of the negative terminal of the battery.  When the wire is disconnected, a spark should be visible from the coil.

This spark should be white or blue in color.  If the spark is yellow, orange, or even red, your battery or your coil (most likely your coil) is on its way out.  It may also be worth checking your spark plug wires, spark plug, or plug cap if these are replaceable items on your coil.
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