My daughter's car wasn't starting and this little $2 tool from Harbor Freight (see attached photo) helped us diagnose what was wrong (the coil output was not quite enough). It plugs in-line into a spark plug path and lets you see if a plug is firing. It's just a small incandescent bulb in a plastic package. I also used it this afternoon in getting the riding lawnmower running. It wouldn't start; the tool verified that it was getting a decent spark. Some more cranking and starting fluid finally got it running.
Oh, and it's probably more ethical than plugging your mother-in-law into the spark plug wire and grounding her. Not as fun though.
Oh, and it's probably more ethical than plugging your mother-in-law into the spark plug wire and grounding her. Not as fun though.
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