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I have used the 6v alternators on many 32-38 cars. Be sure that the one you are buying is not supplied by MAc's Antique auto Parts. Many vendors sell them. The issue is that with them I have had them all "stay on" and run a battery dead. I usually buy the bracket from Mac's and the Pulley from speedway and pick my own alternator. The alternator I have been using switches on when the alternator starts spinning preventing battery drain. The do have a built in regulator and are a easy one wire hookup.