Unless modified, virtually all Delco alternators (both 10DN external regulator and 10SI internal regulator) are negative ground. However there are a couple ways you can determine ground polarity:
1 - Look at the specs stamped into the alternator case by the tensioning ear. The stamping will indicate factory voltage, ground polarity and rated output like this: 12V NEG 37A (= 12 volt, negative ground, 37 amps output).
2 - If your Dexta has an ammeter, temporarity disconnect ALL the wiring at the alternator. Now connect a battery negative with post to ground and turn on the lights. The ammeter will indicate discharge (hand moves to the left) if the tractor is wired negative ground.
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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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