I have a 1939 Hudson Pacemaker. A previous owner has the electrical all screwed up, mainly the lights. Today, I finally got around to trying to figure out what he did and how best to correct. In the process, I discovered that the battery is connected with negative ground. My shop manual is not specific for 1939, but previous years of Hudsons show positive ground. The car starts and runs fine. What should I do? I want the car to be as original as possible, but also subscribe to "If it ain't broke, don't fix it." Thanks