October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Ignition Spark Tester

Either use an ignition spark tester, or modify a spark plug for use in testing ignition system. To modify plug, cut off side terminal, and install spring clip for grounding plug housing. See Fig 1.

Fig 1: Modified Spark Plug and Spark Tester Testers may be purchased from most tool suppliers.