i have 2 Z915B zero turns and they have worked fine until now. one has developed an issue that has me stumped. i hit the ignition switch to start and there is a faint click and a louder buzz but won't crank, turn over. nothing. nor does the hour meter show. the click/buzz sounds like it's coming from under the instrument cover. i've replaced the ignition switch and the 2 relays under there. no change. battery is full but i still tried a jump. i've jumped around the starter sol, no change. the sound it's making is not like a solenoid. it's a definite buzz coming from (i believe) under, inside, around the console cover. i don't know how to use a meter so i replace parts. yes, i'm a parts replacer. i have ignition switch, pto switch, relays , safety switches, etc. i need input, thoughts, suggestions please.