I have just purchased a 49 ford pickup 6 cyl. It was common to convert the '55 to 12 volts as Ford went to that shortly thereafter. 4. 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. Ford 'messed' with a positive ground for a time during the 1930s. The charging guage shows a discharge most of the time . Pertronix 1283P6 45011 Ignitor II 6 Volt Positive Ground and Flame-Thrower II - 45,000 Volts .6 Ohm Coil Kit for 49-53 Ford 8 Cylinder 4.0 out of 5 stars 2 $152.71 If it turns the proper way its a positive ground. We can convert a POSITIVE Ground system to NEGATIVE Ground by changing the polarity of the battery and the generator; and switching the leads on the ammeter to show a charge when it's charging. By Ted Dumas on Sunday, September 27, 2009 - 12:24 am:. With the other clip, briefly for only a split-second (or a spark occurs) tap the negative ( - ) terminal on the battery. Trying to sell my old 6-v parts is futile. * *Note that most of the old Ford tractor applications were 6V and Positive Ground, meaning the positive post of the battery serves as the ground and the negative post of the battery is the feed for the system. The ONLY difference is current in a positive ground system flows the opposite direction from current a negative 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 … We can also increase the output voltage of a 6 volt generator and use an … Not to say any system is better than another, thank God '55 was the last year Ford used both 6-volt AND positive ground. The positive (+) side of the battery is connected to the chassis and ground. Dax - A positive ground works exactly the same as negative ground. Before going over could you tell me if all 8N's are positive ground such as my 9N? My son-in-law just picked up a 1949 Ford 9N Tractor and it has no spark. The shop manual says it has a positive ground but the 6 volt battery that's in it has been installed as a negative ground. Your year selection only went to 1961. But the 6V battery is also wired with positive to ground. In the 6 volt era Ford and Chrysler products and a lot of others were positive ground. I know Ford switched sometime in that period but I don't know if 54 was the switch year, FWIW, I polarized the system … Anything I am missing in the following steps: 1. on August 17, 2002 at 07:32:19 from (205.188.197.163): A friend has asked for some help getting his 8N started. Hope I … Check which way the engine turns. I just bought a Ford Jubilee with the original 6 volt system. "+" is typically red, and "-" is typically black. I have a 1953 Ford, Customline. G M was the oddball with negative ground. A 6 or 12 volt battery can be either positive or negative ground. The ground signal to the switch post is usually accomplished with a physical button switch, similar to the Ford tractor style shown below. Positive to Negative Ground Conversion. Electronic Ignition Kit: Ford 6 Volt Positive Ground Ford - Fits various models * Fits tractors with 6 VOLT POSITIVE GROUND SYSTEM ONLY. Negative goes to the coil on a negative ground car. It has had the ignition coil ballast resistor bypassed which makes me think the coil may have been fried over time. My question is, "what has to be changed" if I want to change it to a Negative Ground system? There is simply no better electrical grounding screw than a TAPTITE® PRO™ fastener. Pertronix 1266N6 6 Volt Negative Ground Ford pre-1965 6 Cylinder Ignitor. 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. Failing to polarize a 6 volt regulator can cause damage to the entire electrical system of a vehicle. This system effectively earths the vehicle as the chassis attaches to the battery using a positive battery cable. What did they give you, 6 or 12? Make sure that the ignition to the car is in the off position. Also the battery is a negative ground (I thought they were suppposed to be a positive ground… He put it positive ground. positive goes to the coil on a positive ground car like a Model A, 9n,2n, 8n Ford tractor, or anything Ford up to the 12 volt days. To polarize a generator on a tractor having a Delco 12V negative ground system, attach It was rebuilt a couple of years ago and worked ok until the owner replaced the battery. To polarize a generator on a tractor having a Delco 6V positive ground system or a Lucas 6V or 12V positive ground system, attach one clip to the A terminal on the generator. Think of left hand vs. right hand threads - both accomplish the same thing only one tightens the opposite direction from the other. This means that the negative (-) terminal of your battery is connected to the supply wiring and starter terminal. Ford Mercury Ford Ignitor Electronic Ignition, 6V Positive Ground, Flathead, 1942-1948 Ford MAC's warehouse is open, shipping daily and ready to meet all of your automotive needs. Ford discovered in late 1927 that Chevrolets were negative ground. Ford did not start using an alternator until 1957, when it … It makes NO difference whether the system is a positive or negative ground when you are charging the battery from an external source - Just be sure to hook the pos to the pos terminal on the battery and the neg to the neg terminal on the battery. But then, you probably wouldn't be swapping your car's electrical system, and wouldn't be reading this. Again looking for … 1949 Ford 9N Tractor - 6V system - Do they run a positive or negative ground? It was positive ground and had a generator, not an alternator. Your Model A was built with a 6 volt positive ground system. This ignitor kit fits most 1949-1953 Ford Flathead V8's and provides increased voltage for improved performance and fuel efficiency. My first car was a '55 Ford Customline 2-door sedan. Does anyone remember if this car would be positive ground. The alternators that were available were all 12v negative ground and some of the old cars including the Model A Fords were built as 6 volt positive ground. 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. And clean contact is the key to insuring optimum electrical conductivity. 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. 6V or 12V positive ground system, attach one clip to the A terminal on the generator. 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. It has a 12V generator that is working fine. Bill Pertronix 1266P6 6 Volt Positive Ground Ford pre-1965 6 Cylinder Ignitor. Disconnect the battery 2. 1948 - 1956 F1, F100 & Larger F-Series Trucks - 1949 F1 Grounding - Trying to put my truck back to as near original as possible after its been thrown together by the PO. Ford, Chrysler, Cadillac, Oldsmobile, Pontiac, Nash, Hudson, Frazer, and Studebaker were all positive ground at some time in the 30s. Most, if not all welders were positive ground. Where exactly do the ground straps go from battery positive to frame, engine and firewall. Reverse the wires on the coil 3. The same parts in 12-v brings much more money (like a heater motor). There are only a couple of cases where it is better to stay with positive ground. The cable is tethered to the battery at one end and the engine block at the other. Cadillac changed to NEG ground in 1946, but the Ford, Chrysler, Nash, Studebaker and Packard all stayed with the POS ground system. The electrical system is Positive Ground. Add to Cart Add to Cart Add to Cart Add to Cart Customer Rating: ... self contained and maintenance free electronic ignition system. While positive ground electronic ignition systems are available, conversion to negative ground may make sense prior to upgrading your ignition system (as once you buy a positive ground electronic ignition, you won’t be able to easily convert to negative ground without buying another ignition unit). Never change points again with the PerTronix Ignitor System. Posted by Upper Peninsula Mi. A positive ground system works by directly connecting the chassis of a vehicle to the positive side of the vehicle's battery. This insures a positive metal to metal contact even in painted or coated nut members. This is opposite to all modern cars that use a negative ground. Hudson switched from negative to positive ground in 1934, and then back to negative in 1956. When Ford and Chrysler went to 12 volt they also went to negative ground. Learn More The Perfect Grounding Screw. 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. I am switching it to a NEGATIVE ground system tomorrow. What are the issues with the battery installed as a negative ground vrs the recommended positive ground. 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