MS 250 wont shut down

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ghost1

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• Jan 28, 2017 / MS 250 wont shut down

• #1

Is it possible coil has broken down not allowing it to ground? All wiring checks out ok.

 

NorthBama

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• Jan 28, 2017 / MS 250 wont shut down

• #2

I had a troy bilt trimmer that did the same was a bad coil would not ground to shut down

 

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ghost1

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• Jan 28, 2017 / MS 250 wont shut down

• #3

Thanks, that's the way I was leaning. Ever had any luck with the aftermarket versions on BaBay?

 

RDA.Lawns

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• Jan 28, 2017 / MS 250 wont shut down

• #4

Ms250 sthil chainsaw? If yes its the wire in the kill switch. It has a barrel end slid into the kill switch. They slide out sometimes and don't ground out to kill it. Take the top handle assembly apart. You can see it. Not a hard fix.

 

RDA.Lawns

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• Jan 28, 2017 / MS 250 wont shut down

• #5

Corrections the kill switch is under the top cowling. Take it off you can see it. This model has a kill switch spring that tends to break. Less than 10$ in parts.

 

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ghost1

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• Jan 28, 2017 / MS 250 wont shut down

• #6

Thanks,.. I used continuity check and ran wires to ground. Switch operates as it should, however coil is still sending spark even when it's grounded.

 

NorthBama

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• Jan 28, 2017 / MS 250 wont shut down

• #7

ghost1 said:

Thanks,.. I used continuity check and ran wires to ground. Switch operates as it should, however coil is still sending spark even when it's grounded.

Click to expand...

that is how I tested the one I had and just like you said saw would not shut off

 

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bertsmobile1

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• Jan 28, 2017 / MS 250 wont shut down

• #8

So the switch works, but is the cut out wire still attached to the module ?

 

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ghost1

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• Jan 29, 2017 / MS 250 wont shut down

• #9

Yes, still connected. When switch is closed, there is continuity from module to ground, however, saw will still start even leaving switch closed (off).

 

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bertsmobile1

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• Jan 29, 2017 / MS 250 wont shut down

• #10

ghost1 said:

Yes, still connected. When switch is closed, there is continuity from module to ground, however, saw will still start even leaving switch closed (off).

Click to expand...

Then the module has an internal short as you initially thought.