Posted by wore out on November 23, 2021 at 21:59:36 from (64.255.159.199):
In Reply to: spark coil questions posted by Bob N.Y. on November 23, 2021 at 14:06:20:
Quoting Removed, click Modern View to see
X2 to what Jim wrote!
"Youtube is not always correct!!!
"The markings on a coil with the primary terminals labeled "BATT" and "DIST" will only be correct when it is used on a system of the same ground polarity as the machine it was designed/sold for."
It's easy to determine if the spark polarity is correct with an ignition oscilloscope (but you probably don't have one, LOL), the voltage spike that leads up to the firing of the sparkplug is "negative-going" when coil primary polarity is correct.
If you are a bit more adventurous you can use the "pencil test" to determine spark polarity!
"A quick simple check for correct coil polarity can be made with an ordinary "lead" pencil.
Place the lead of the pencil in place between the spark plug wire and the plug.
Start the engine and observe the spark (fig. 6-52).
If it "flares" or has a yellow tinge on the plug side, polarity is correct.
If it "flares" or has a yellow tinge on the wire side, polarity is reversed.
I'll leave it to you to figure out how to hold/support the pencil without getting a shock!
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