This mower has a briggs 18.5 hp 31P777-0299-E1 engine was starting and running good. I shut it down to refuel and now all it will do is click at the solenoid switch. I changed out battery from a running unit even though the battery tested fine over 12 volts. I have checked wire connections and fuse block and all seems to be well. It tried to turn over by jumping the solenoid but would not. Pulled starter off engine and it will spin when hooked to battery cables. Please give me some input on this.