First, make sure the safety interlock switches for the PTO and the clutch/brake pedal are working, if they don't close, the ignition circuit is disabled. The clutch pedal switch is underneath the tunnel cover and is actuated by a spring lever attached to the clutch pedal/brake shaft. Short the two wires together to eliminate the switch if it's bad. The PTO switch is similar, but inside the dash tower. (some don't have the PTO safety switch--my 149 doesn't but my 108 does).
Since the starter worked after the battery was fixed, I'd guess it's still fine. To test it, use a pair of jumper cables from the battery directly to the starter (Pos on the Positive terminal (large wire post) and negative to a good ground. If this turns the starter over, then work backwards to the starter relay and then the ignition switch, both under the dash.
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