I think you should start a new thread for the wiring problem, Paul. It is on a different machine, and has nothing to do with the erratic running problems you've had with two different engines when you attached them to one particular base. At this point I don't know what either of the first two mowers is (the one the Tecumseh was originally on, and the one the chonda was originally on). This thread is specifically about the Tecumseh engine. It may or may not have a damaged ignition module, following its temporary fitment to the Millers Falls mower - we have to look into that in your second thread (Millers Falls 13 hp). I suggest you name your new thread after this third mower that now has electrical difficulties, and begin it by posting details of what that mower is and what has happened to it. Next time you post to each of your two existing threads, give details of those mowers. Also, for all three mowers, make the test I asked for in my previous post: disconnect the kill wire at the ignition module, then connect the positive lead of a voltmeter to the kill wire coming from the mower, with the negative lead connected to the frame of the mower. Take a reading with the engine switched off, and with the engine switched on. Report the result for each mower in its own thread. We'll keep the three threads separate. Please don't make any more experiments without talking about it first, in the appropriate thread.