I have a 2001 Walker with a 25 hp Kohler ( I'm not the original owner but I don't believe this to be the original engine because the serial number tag on the body reads 20 hp engine ). It has 675 hours on it ( according to the hour meter ). My problem is this : It has intermitent starting problems. There is no rhyme or reason to when it won't start. You turn the key and it does not even try to turn over - so my thoughts are electrical. The dealer that I have taken it to the 4 times that it has done it in the last 2 months have : Replaced the ignition switch the first time Tightened the started cables the second time Replaced a switch relay the third time Replaced the starter cable ends the last time All 4 remedies worked - for a time and then out of the blue again - it will not start. Any thoughts on possible culprits that would have still gone undetected with the previous 4 bandaid approaches ? Where can I find a skematic of the wiring breakdown for the engine ( not in any of the manuals ) ? Any thoughts or directions to pursue would be appreciated. I hate to trade it in or sell it because I love the mower - when it runs - but the unpredictability is starting to cost me time and money.