Posted by Bob on February 03, 2008 at 09:22:43 from (69.178.229.154):
In Reply to: coil resistance posted by L.C.Gray on February 03, 2008 at 09:03:43:
A typical "Kettering" ignition coil will have between 0.5 Ohm and 4 Ohms of resistance beteen it's primary terminals.
Typical secondary resistance will be in the 4000 Ohms to 10,000 Ohms range, measured from one of the primary terminals to the secondary connection in the "tower".
There will be a difference (equal to the primary resistance) in the secondary Ohms measurement, depending upon which primary terminal you measure it from, NOT enough to be significant, or likely even MEASUREABLE by all but "lab grade" equipment.
HOWEVER, just because the measured resistance seems on the OK range, it DOES NOT mean the coil will make a good spark. Even ONE shorted turn, which isn't even enough to noticeably affect the resistance reading will GREATLY reduce the spark output.
Also, a crack, or "carbon tracking" in the high-tension area will bleed off spark, but probably NOT show up as a change in winding resistance readings.
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