Strimmer wont stop!?

To stop any brush cutter it is just a mater of taking the ignition unit to earth, so a continuity test of the switch is the first step, if ok a continuity test of the wire from the unit to the switch, if ok a continuity test to the eart return wire if fitted, if it relys on the switch earthing in the body then make sure the switch is tight and making a good earth, last of all replace the ignition unit

Husqvarna man
July 2010