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Line trimmer does not appear to have spark. How do you test a coil wire?

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You can connect a new spark plug to the spark plug wire and ground the spark end to the motor you should see a spark if not ajust coil to 010. from flywheel if no spark after that coil is bad get new coil

Posted on Jul 18, 2009

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The only way I know how to test a coil is to take the small wire that hooks into the tab on the coil off and then use a spark tester, this way you isolate the problem to either the spark plug or the coil. unplugging the small wire will eliminate the coil being grounded out by the switch.

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If the wire runs all the way to the inside of the coil pack, then you will have to replace the whole coil unit.
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If you have spark problems, remove the wire and then remove the plug, reattach the wire and ground the plug to the engine and pull the string, you should see arc and hear it pop, if not, take the plug to another piece of equipment and remove that equipment's plug wire and attach it to the plug from the weed ******* and then ground it and test it. If still no spark, then plug bad, if plug then the weed ******* has a problem with the spark plug wire or the ignition coil.

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The best test for an ignition coil is removing the wires going to the kill switch at the coil. Most small engines will run with the kill circuit open & stop when you ground it. If you disconnect the kill wire & you have no spark, than it's a coil.. If you do have spark, check the switch & kill wire for a possible short.

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Check the wire that goes to the "OFF" button. See if it is by chance loose or cracked allowing a short. Beyond that, it would probably be the coil, but I would lean towards some type of a short, especially if you know the plug is OK.

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Disconnect the small spade terminal wires from the coil itself and test for spark. If you do not have spark replace coil. If you do have spark check those small wires for insulation damage and grounding. If wires are OK check kill switch.
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Craftsman flipover head string trimmer. Will not start. No spark.


could be coil also could be a fouled,dirty flywheel,check coil wire

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  1. Remove the flywheel cover and pull the ground wire off of the off of the coil...
  2. Check for spark...
  • If you now have spark you have a "short to ground" some where in the in the wiring
  • If you still don't have any spark you'll need to replace the coil

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