Hello, my father was using our ZD331 today. He pulled it up to the house and turned it off to add fuel. He went to restart it and nothing. We can hear something click when we turn the key. I have checked the petal switch, both arm switches, the fuses and relays under the seat and all good. Tried to hot wire the starter and wouldn't crank. Took it to town to be tested and it passed, so lost. Any help is greatly appreciated thank you. It has about 481 hours on it.