The main reason to use negative ground with 12 volts is that you can use it with modern electronics but it would work with positive ground. The cable is tethered to the battery at one end and the engine block at the other. I just bought a Ford Jubilee with the original 6 volt system. on August 17, 2002 at 07:32:19 from (205.188.197.163): A friend has asked for some help getting his 8N started. Electronic Ignition Kit: Ford 6 Volt Positive Ground Ford - Fits various models * Fits tractors with 6 VOLT POSITIVE GROUND SYSTEM ONLY. Pertronix 1266P6 6 Volt Positive Ground Ford pre-1965 6 Cylinder Ignitor. 6V or 12V positive ground system, attach one clip to the A terminal on the generator. Hudson switched from negative to positive ground in 1934, and then back to negative in 1956. It has a 12V generator that is working fine. He put it positive ground. The Perfect Grounding Screw. Before going over could you tell me if all 8N's are positive ground such as my 9N? Dax - A positive ground works exactly the same as negative ground. When Ford and Chrysler went to 12 volt they also went to negative ground. G M was the oddball with negative ground. It has had the ignition coil ballast resistor bypassed which makes me think the coil may have been fried over time. This system effectively earths the vehicle as the chassis attaches to the battery using a positive battery cable. My 48 Dodge D-24 [ by the previous owner ] was converted to a 12 volt system, however, it was kept as a POSITIVE ground system. The new Model A introduced in 1928 required a clean break from the past and certainly needed to be different from the Chevrolet automobile and thus the positive ground came to … This insures a positive metal to metal contact even in painted or coated nut members. Make sure that the ignition to the car is in the off position. I have just purchased a 49 ford pickup 6 cyl. Think of left hand vs. right hand threads - both accomplish the same thing only one tightens the opposite direction from the other. A 6 or 12 volt battery can be either positive or negative ground. "+" is typically red, and "-" is typically black. If it turns the proper way its a positive ground. Disconnect the battery 2. The "universal" switch to negative ground never occurred in the U.K. Nash Metropolitans remained positive ground, and allegedly some US car models made for export to the U.K. are still set up with positive ground. Posted by Upper Peninsula Mi. I know Ford switched sometime in that period but I don't know if 54 was the switch year, FWIW, I polarized the system … The ground signal to the switch post is usually accomplished with a physical button switch, similar to the Ford tractor style shown below. Most, if not all welders were positive ground. I have a 1953 Ford, Customline. Never change points again with the PerTronix Ignitor System. There are only a couple of cases where it is better to stay with positive ground. The quickest why I can think to check for polarity is to (for positive ground) connect a jumper from the negative side of the battery to the starter connection, and the positive jumper to ground. Hope I … The solution was at that time to change the Model A Fords over to 12v negative ground and enjoy the modern convenience of the alternator on the old car. Ford, Dodge, Chrysler, Plymouth, DeSoto, Studebaker, Cadillac, Kaiser, and some other brands wired their early automobiles with the positive terminal of the battery to ground, or the frame, and the negative to the starter and electrical system. , and would n't be reading this this Ignitor kit fits most 1949-1953 Ford Flathead V8 's provides. Failing to polarize a 6 volt era Ford and Chrysler ford positive ground system and a lot others. For … Never change points again with the pertronix Ignitor system of the battery is connected to the terminal... 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