Stator grounded or shorted

[Tim Ziethen 4]

I have a 1116k801 c-165 tractor that worked great until yesterday.  Blowing the 15amp fuse behind the dash that is connected to the battery and amp meter.  Happened three times but now blows fuse without key in or tractor running.  I must have a short to ground and it is not the amp meter.  The wires go to the stator and seat sensor.  I pulled the seat sensor and it was not touching anything.  How do I check the stator for resistance and grounds - what should the readings be?  It is starting to look like the stator is directly grounded. Put a amp meter inline and the short is there with the tractor off and the key out.

 

Thoughts - 

 

Did not what to pull the flywheel without more troubleshooting - the circuit goes through the rectifer which I also unbolted but wanted to be careful with the stator.

 

Thanks

Tim

 

 

[ri702bill 9,444]

Maybe one of the wires is chafed - look at the wire routing near the flywheel..... if so, that may be a simple fix. Or a new stator.....

[squonk 43,842]

Disconnect the 2 wires from the stator at the rectifier. Reconnect the battery and plug in a fuse. If the fuse doesn't blow, you now know it's either one of the stator wires chafed or the stator itself. The most likely place for the wire to be chafed is where it passes from behind the bearing plate to the stator itself. Which means you're going to be pulling the flywheel. 

[953 nut 60,057]

6 hours ago, Tim Ziethen said:

The wires go to the stator and seat sensor.  I pulled the seat sensor and it was not touching anything.

6 hours ago, Tim Ziethen said:

Blowing the 15amp fuse behind the dash that is connected to the battery and amp meter. 

That should be a 25 Amp Fuse

When checking for a grounded wire or component use a 12 Volt test light in place of the fuse. If the light is on brightly the short is present, when the short is removed the light will go out. No need of wasting fuses and the change in the light will get your attention faster than a meter.

Have you inspected the wire to the seat switch? Frequently an electrical short will be a matter of chafed insulation or a pinched wire rather than a component. 

[Tim Ziethen 4]

What should the stator resistance be - is this a valid test?  Also assume it should be infinity to ground?    Also - is there a way to test the rectifying with a VOM?  Please confirm if anyone knows this - thanks!

[gwest_ca-(File Mod) 11,488]

For 15 amp stator

[squonk 43,842]

This test in red is only valid with the leads hanging free. A chafed lead can be repaired instead of replacing the stator