I have a 1985 STX38. One day I was mowing and it shut down like I had turned off the key. Now it doesn't do anything at all. No clicking when you turn the key or anything. I was having trouble with the PTO kicking out before that happened, if that helps. I did find 2 wire under the engine that were not hooked any where. Both black, one part of the PTO harness and the other a large cable, like a ground cable. Were should these be bolted to? Maybe that's my problem. Thanks.