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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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plink_plonk
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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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No spark after renew of coil and plug.


Assuming you have read other posts here about air gap and have it set approximately correct, the next thing to do is disconnect the cutout wire from the coil (small wire with spade connector). When you hit the kill switch, this wire is grounded to the chassis of the saw, which prevents the ignition coil from generating a spark. Often, the insulation on this wire can fail, allowing the wires to short against a metal part, or the kill switch may be faulty.
If you have spark with this wire disconnected, check the wire itself for any breaks. If it looks good, then the only thing left to check is the switch.
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1 Answer

Blown inj fuse


It could be a short in the wiring-a bare wire touching metal, but sometimes an injector will go bad and short out blowing the fuse. Try unplugging all the injectors, then put new fuse in and turn key on. If fuse blows again, it must be a bad wire in the injector circuit. Each injector has a power wire and a ground wire, the power wire probably derives from the engine computer, and the ground wire definitely goes to the computer.
If the fuse didn't blow right away, try connecting one injector at a time (key on). If connecting one injector causes the fuse to blow-that is a shorted injector. It will have to be replaced.
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2 Answers

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 out...it'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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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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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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