I have a Toro 44" walk behind with a 12.5 hp Kawasaki fb460v engine. My problem is the clutch will not engage. I can take a battery, power it up and it engages and blades spin. I have checked power at connector to clutch and it has power and ground. I could not find my multimeter today, so I used my battery tester and it pegs the needle at 16 volts when I hook it up with the engine running. Anyone have any ideas what is going on? I bought the mower last week and it had been sitting for several years.