No Spark At a Loss

[BGrizzleC105 5]

So a couple weeks ago I bought a C-80 with a blown k181 it came with a good k181 out of a Deere i switched over all of the wheel horse stuff dropped it in. It cranks over just fine but has no spark have power to the coil and to the points but have no spark cleaned and set the points to 15 thousand switched the coil and condenser of a runner and still nothing any help would be greatly appreciated thank you.

[wallfish 18,254]

Check for 12v to the positive side of the coil when the key is in Run and Start positions.

Points and condenser connected to the negative side of the coil.

Make sure wire to points is not grounding to the cover, or anywhere else

Spark plug?

[BGrizzleC105 5]

Did all of that when I went hunting for the problem and the plug is new.

[Ed Kennell 42,232]

Have you also swapped in a good   coil / plug wire ?

[WH nut 553]

Make sure you drop the 12v at the point when they open. Check at the neg side of coil. If you don't drop the voltage either points are grounded or the wire.

[BGrizzleC105 5]

Ok I will check that and yes the coil and plug wire came off of my running tractor.

[Anglo Traction 761]

Point gap should be 20 thou.

Have you got a Solid mount or Shaker Plate mount on the K181?.

Either way, you must ensure your Engine ground connections to the Tractor Frame (bolts and/or cable) are clean or you won't get a spark at the plug from good ignition system components. 

Hope you get her runnin soon. 

[BGrizzleC105 5]

I have a shaker plate and will set the correct the gap will check the ground wire on the shaker plate

[Save Old Iron 1,571]

one method of performing an off tractor but "live" test of an ignition coil

 

[Save Old Iron 1,571]

check the coil primary resistance

 

[Save Old Iron 1,571]

and then a secondary circuit check

 

(I have to change the text to read 6000 to 10.000 ohms)

 

 

[WH nut 553]

I just love the time you take to make the diagrams SOS

[N3PUY 1,031]

Do the points open and close? 

[BGrizzleC105 5]

I'm going to try and work on it tonight thank you for all the help and diagrams they are  awesome and yes they do open and close. 

Edited May 29, 2014 by BGrizzleC105

[N3PUY 1,031]

With the points open, jump the gap with a screwdriver, you should get a spark at the plug each time the gap is jumped...... just like the points opening and closing.    Another thing ... with the points open the voltage at the wire connecting to the points should be 12V ... then when the points close that voltage should drop to "0".

[Save Old Iron 1,571]

Edited May 29, 2014 by Save Old Iron

[Save Old Iron 1,571]

[Ed Kennell 42,232]

Thanks SOI,  Great dwgs.   Everyone should have copies in their toolbox.

[N3PUY 1,031]

Yea! Like "Save Old Iron" says (shows).

[Save Old Iron 1,571]

With the points open, jump the gap with a screwdriver, you should get a spark at the plug each time the gap is jumped...... just like the points opening and closing.    Another thing ... with the points open the voltage at the wire connecting to the points should be 12V ... then when the points close that voltage should drop to "0".

and remember you need a good condensor to make a decent spark

 

and the spark will jump when you REMOVE the screwdriver from the points

Edited May 31, 2014 by Save Old Iron