[rwairforce]

Yes it can get frustrating and I totally understand. I've had cars act the same way, they seem to fail only when I needed them and out came the tools again. It can be something simple but that doesn't help when you've already had a terrible day for a host of reasons and then you flop down on your Cub and nothing!
This is one fantastic reason that it's good to have more than one, especially when they're old. I have 8 Cubs with 4 ready to mow. This eliminates most concerns related to mowing and having a machine ready to jump on while buying me time to fix the one that won't work.
All 4 of my ready to mow Cubs cost less than one brand new one today so I feel pretty good about them.
Good luck and check those wires. I've even added a second ground wire just because of all the time I've heard people talk about the ground causing problems.