Like Bob said, it's time to get out the old test light or voltmeter. I beleive a 4620 has a main circut breaker and a starter relay just above and to the rear of the starter. Check for battery voltage at those components. Check for battery voltage at the alternator's "B" terminal. I worked on a 4320 not too long ago with a very similar problem, the harness rubbed thru where it runs behind the engine block, causing the heavy wire between alternator and main breaker to burn up. Also double check your battery cables very carefully. Wiggle around where each cable is crimped into the terminals on each end while someone watches for the dash lights to come on. Had a combine this week that acted very much like dead batteries, in the end it turned out to be that the terminal on the engine block end of the ground cable was loose, was discovered by wiggling on cable, and problem was only visible after cutting off the heat shrink wrap over the terminal.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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