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Todd,

Do you have the TM1590 manual as a reference? If you have 12 volts on the positive side of the ignition coil low voltage winding, the TDCM is not your problem. The safety switch states and the TDCM will shut down the ignition by removing this 12 volts if conditions are not met correctly. Here is the wiring excerpt:
Text Technical drawing Diagram Plan Drawing


There is a series of tests in the manual you can do to verify that the electronic ignition module is OK --

View attachment ign module tests from 318 Tm1590 page 240-20-18.pdf


One quick question -- how did you determine that you had no spark on the P-series engine? Since the two spark plugs are wired in series through the engine block (in other words the high tension side of the ignition coil is floating relative to ground and both plugs must fire at the same time...) you need to ground one plug wire to test the remaining one. Pulling both plugs out of the engine allows the starter to crank it faster as well, you should see spark under those conditions.

Let us know what you find.

On the 316, you may have a blown F2 fuse keeping the PTO from working so check that... Does the PTO lamp light or not? The TDCM is as not likely to be causing the symptoms you see with the 316 as the components and wiring external to it.

Chuck
 

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The lack of the rotor being installed is definitely a solid explanation for there being no spark on the P-series motor. When you take it back apart be sure to inspect the key at the flywheel to crankshaft interface and ensure it is in good shape -- it is the extended tail on this key that engages the rotor and keeps it "timed" to the crankshaft rotation.

As to the B-series 316, there are good tests in the TM1590 for your stator and regulator that make up the bulk of your charging system:
Text


Text Font Line Parallel Number


Chuck
 
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