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Coil wire is too short for the Stihl 46 trimmer. Wire fails.

Wire insullation fails after being stretched over time and shorts against the engine, resulting in a no start.

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: trooble shooting for possible fuse or relay or blown breaker from internal short from wire shorting out

That coiled part is a current or voltage sensor depending how they connected it. The shorted wire "may" have just blown a fuse on the control board if it was supply voltage for the sensor. The control circuit voltage is a nominal 24 volts, often tapped off from a winding on the cooling fan. So trace where those wires go and you should find the fuse or fuses for the control board. If the control board has a "pico fuse" it may be difficult to locate. b ut replacing it and the wire in theory should correct the problem.

Posted on Sep 26, 2012

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SOURCE: bg86c stihl blower no spark new spark plug new coil gapped right take ground wire off still nothing

Sounds like a tricky one. Have you checked the magetism/functioning of the flywheel.? Tracking back the problem by having a new spark plug and coil would next point you to the flywheel. Coil to flywheel gap should be 0.25 feeler guage.

Hope this proves useful. :)

Posted on Mar 16, 2013

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How to check if the spark plug fire

Hi there ,
Please remove your plug wire from plug. If you have removable cap of wire tip, just remove it. Then use the plier ( with good insulation) to hold your wire. Use non electrical conducting shoes. Then make a gap ( about 1 mm) between wire tips and metal body ( or engine ) of your bike. Short start your bike and see how the the wire tips spark the electricity to your bike. If it has nothing your coil or coil incoming power is fail. If your have blue spark, you have tip top condition of coil.
Best regards, vote please, Jay

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1 Answer

My trimmer cranks good and starts off running good. After about 5 and sometimes as long 10 mins it will suddenly start running 1/2 speed. I 'm guessing something is getting hot and causing it to miss fire?...

the ignition coil is shorting's a stihl thing...seen it too many times...get another coil...if it's new, it's under warranty (a dealership "must" repair to get warranty)...

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1 Answer

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1 Answer

Replaced stop switch and it still won't shut off!

While attending college, I worked at a tool rental center and learned many tips and tricks from the mechanics. The problem that we heard the most from customers was that the machine would not start. Your your machine at least starts and runs fine, however will not shut down with the factory kill switch. Many times when replacing the mag. (spark coil) the kill wire would rub against the flywheel and break or over time the conductor wire will break inside the insulation. If you kill switch only has one wire, then all the kill switch does is short the mag to ground. Simple test is to remove spark plug, re-connect wire to plug, touch plug to engine and pull rope to observe spark, then short the tab on the magnito to ground, should be no spark. If you still have spark, coil is defective however good enough to run engine. Kill with choke or pull wire. If no spark with test, make new wire from tab of coil to kill switch or any switch that will short tab to ground. Good Luck

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