Troy Bilt Trimmer

Reply

  #1  
Old 08-05-17, 02:05 PM
Member
Thread Starter
Join Date: Aug 2017
Location: USA
Posts: 4
Troy Bilt Trimmer

I have a Troy Bilt trimmer TB425CS that will not shut off. Starts great, but have to pull plug wire to stop it. Replaced kill switch with OEM part and still will not shut off. Have not been able to find a wiring diagram. Any help appreciated. Thanks.
 
Sponsored Links
  #2  
Old 08-05-17, 03:16 PM
Member
Join Date: May 2006
Location: Iowa!!!!!
Posts: 3,728
Trace your plug wire back to the coil. It will have a small wire connected to it, or should. That's the kill wire. The switch you put in is a continuity to ground switch. Probably the wire from the coil is either disconnected or broken enroute to the switch.
 
  #3  
Old 08-05-17, 06:29 PM
Member
Thread Starter
Join Date: Aug 2017
Location: USA
Posts: 4
Thanks. Will give that a try. Was hoping I didn't have to get into the engine that far.
 
  #4  
Old 08-06-17, 09:21 AM
Member
Thread Starter
Join Date: Aug 2017
Location: USA
Posts: 4
Took trimmer apart down to coil level. Two wires, black and red from switch. No others other than plug wire. Continuity through both wires from switch to coil. Old and new switches test the same, continuity across switch when what should be kill position. Trimmer runs regardless of switch position. What m I missing?
 
  #5  
Old 08-06-17, 12:08 PM
Member
Join Date: May 2006
Location: Iowa!!!!!
Posts: 3,728
Continuity is from kill wire connector at coil to ground with switch in off position.

The two wires you have - one runs to ground, the other runs to the kill connector on the coil. You have a break in the wire circuit. Either a wire is broken, the wire at the coil isn't connected, or the wire on the other side of the kill switch isn't grounded.

First disconnect the kill wire from the coil, then run the continuity to ground with the switch in off position. Then hook the wire back up to the coil.
 
  #6  
Old 08-06-17, 01:22 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
I've seen some of these coils fail where the kill wire connector doesn't connect to the inner windings, so even if you ground the terminal with the switch, it doesn't kill the spark. Seen it several times now.
 
  #7  
Old 08-07-17, 12:23 PM
Member
Thread Starter
Join Date: Aug 2017
Location: USA
Posts: 4
cheese, I'm going with your thoughts. New wires, connectors and switch. Runs like a top, won't shut off. Shut off will be pull plug wire like I have been doing. Thanks for the help everyone.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes