Cub Cadet Challenger Series Service Manual page 222

Check the Spark Plug Cap resistance.
10K ohms
Check the Ignition coil resistance.
Connect multimeter as shown.
Positive lead to Orange lead terminal.
Negative lead to Ignition coil base.
Primary coil resistance
0.18 – 0.28 Ohms
Test Secondary coil resistance.
Connect multi meter as shown.
Positive lead to Orange lead terminal.
Negative lead to Spark Plug Lead.
Secondary coil resistance
6.32 – 9.48 K Ohms
Both Tests meet specification
Test the Main switch for continuity.
Correct
Test the A.C Magneto coupling resistance.
Connect multi meter as shown.
Positive lead to White/Red terminal (1)
Negative lead to White/Green terminal (2)
Pickup coil resistance
220-280 Ohms
Test the A.C Magneto coupling resistance.
Connect multi meter as shown.
Positive lead to Red terminal (3)
Negative lead to White/Blue terminal (4)
Pickup coil resistance secondary
0.063 – 0.077 Ohms
Meets specification
Electrical
Out of Specification
Incorrect
Incorrect
6‐13
Replace the Spark Plug Cap
Replace the ignition coil
Replace the Main switch
Replace the pickup
coil/stator assembly