ztr mower with new motor, kill switch trouble

I have an exmark walk behind mower and recently replaced the 14 HP single cylinder kawasaki engine with a new 2 cylinder 15 HP kawasaki engine. The old engine was a pull start and the new was designed as electric start. I bought this engine since it was much cheaper than the pull start mowers. I paid a few bucks to have it converted to a pull start since my mower isn't set up for electric ignition. The only trouble is I am having trouble getting the kill switches to work. The levers on the handles should allow the mower to be in gear and/or the blades engaged, but if you release the handles the mower dies. With the new motor I am having trouble getting this all to work properly. There is a black wire on the mower that is the kill wire and if I connect this to ground when the engine is running it will die as it is supposed to. But when I hook up the old kill wire from the mowers wiring harness to this kill switch, the safety devices won't kill the engine.
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