sounds like your alternator is staying excited which will kill the battery overnight, on a 165 there is a tee below the oil pressure gauge with a pressure activated 2 prong switch which switches the gauges and alternator on and off. There is a small diode in the the wire going to the alternator to prevent back feed the gauges when the engine is shut off. To check this with the engine off unplug the 2 wire connector from the alternator, the # 1 regulator wire shouldn't have any voltage, if you do that is causing the alternator to stay excited, start the engine and it should have voltage to excite the alternator, to check the diode if it's still in the system, and you have voltage with the engine running, the alternator hooked up shut the engine off and watch to see that the gauges switch off when the oil pressure goes to 0 if not the diode is missing there by causing a drain on the battery keeping the gauges hot. MAKE SURE you are working on a 3 wire set-up they can look identical, personally I don't like a care for the 1 wire system because of pass issues with them, if it has a one wire alternator please disregard the information above.
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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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