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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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