You need to just try jumping it across the solenoid while the starter is mounter like it was. It was common for the older mowers to NOT carry enough current through the key switch/safety circuits to engage the starter solenoid.
How to fix it:
1) Check all of the connections. Especially the ones on the key switch, safety switch and starter. If any of those are corroded it will not crank. ( Really check out the brake safety switch. It is under a shield and riveted to the frame under the battery. They are the trouble many times.)
2) Install a relay in the start circuit. JD makes a "kit" to do it but most good parts stores carry the small square relays and the harness in a kit for around $10.
So you would hook the wire that is currently going to the starter solenoid to the energize wire on the relay. Hot to battery terminal at the starter. Ground to one of the engine mounting bolts. Now the "factory" wiring only has to carry enough current/amps to energize the relay.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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