I did a Crapsman yesterday with the same problem. The wire that engages the solenoid was chafed and touching the frame. Took me a bit to find it cause of all the dirt and such. At least you know it in the starting circuit.
In the service books and schools they always preach to isolate the systems when doing elec work. I did a 26 command on a Toro with fuel injection the other day had no spark. We don't do enough fuel injection, or ECM's, to have the soft ware package so we went threw and isolated the different circuits. Never threw a fault code but by taking the different systems out of the harness we narrowed it down to the speed sensor. Then from there we found a connector in the harness for it was pushed out of the back not making a connection, and not letting the coils fire.
Yes its true, Ill admit it you disable the safety system, but this is how it tells you to do it in the shop repair manuals. Also I'm sure, cause Ive seen it done, on the scanners for your car to trouble shoot you do the same thing. Isolate the systems, weather you put the ECM into limp mode, no start or take the fuel rail out of the equation to test for compression threw an amp gauge. When I worked for cat they would run our ECM's via remote controlling the throttle via lap top with no one in the truck.
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