In Reply to: 9N ? posted by Tiger Dobrenic on July 17, 2020 at 16:29:37:
First, don’t rely on a serial number to fully ID your tractor –it only ID’s the engine block and may have been swapped out with another at some time. Go by the important points like front mount dist, correct gen, correct starter, 6V or 12V, and more. The Master Parts Catalogs can help and ID parts. Also, don’t go nt and grille badges or steering wheels. You can get FREE downloads in our MANUALS forum. OEM Owners, Service Manuals, and the I&T FO-4 Manual also have info –electrical diagrams included. Get the ESSENTIAL MANUALS for your shop and coffee table – they are as valuable as any wrench. Your engine block serial number is a 1940 model. Oval tube rad rods didn’t come out til 1944. So, your tractor may be a mutt - parts from others are mixed in. Unless you are trying to do an all correct original restoration, forget about the serial number. So, regarding your descriptions, ALL 9N’s after s/n 12500 and ALL 2N models used the 1-Wire/3-Brush 11 AMP ‘A’ Circuit generator with the roundcan cutout circuit, the 1-Wire Starter Motor and NO Solenoid. Did you mean your genny has TWO wires, not brushes? The front mount distributor, Ballast Resistor AMMETER, and ignition switch were all OEM. The first, early 9N-10000-A genny was a 2-Wire/2-Brush ‘B’ Circuit 7-AMP unit. It used a rectangular Voltage Regulator. At s/n 12500 the ‘B’ generator was used – 1-wire/3-brush 7A, A’ circuit with a HI-LO 3rd Brush slider button and cutout. Both the ‘A’ and ‘B’ unit were small 3-1/2” barrel units. When the 9N-10000-C unit was released, it was bigger, had a 1-Wire/3-Brush ‘A’ design at 11 amps and the 3rd brush adjustment was now a LO to HI screw on the back plate, and used the cutout. Do you have a screw or a button on yours? Only the larger units could use the generator tensioning bracket. The two small early units had no belt tension device and wouldn’t fit in the later accessory option. The fact yours has two screws tells me it is 2N-10000 generator. This was when Ford added the belt tension device as an OEM unit. It was a larger barrel, 1-Wire/3-Brush 11 AMP ‘A’ Circuit with cutout. The 3rd brush adjustment was the screw setting. Also, the 9N/2N starter motor was a 1-Wire unit. No solenoid was used. The solenoid came out in 1947 with the new 8N Model and had 3-wires. What do you mean “…I see that had a cut out on it and a relay regulator as well…”??? There is a starter switch, is that what you mean? What is a ‘butterfly type radiator screen’? Is battery 6V or 12V? Are you trying to wire it as the OEM 6V/POS GRN original electrical system (you don’t tell us)? Our HOW-TO's forum also has a ton of useful documents -click on LINK below for one on 9N generators. Most of our manuals and How To documents are in pdf format and can be opened, saved as a copy, and/or printed pout but you need to have a version of ADOBE on your computer. If you don't, go to How To's and get a FREE and safe download. Finally, get yourself copies of the ESSENTIAL MANUALS as reference material.
FORD TRACTOR 9N & 2N, AFTER S/N 12500, OEM 6V/POS GRN WIRING:
FORD 9N-10505-B CUTOUT –USED AFTER S/N 12,500 TO S/N 258504 ON 9N & 2N MODELS ONLY:
WIRING PICTOGRAMS by JMOR; OEM 9N & 2N ELECTRICAL SETUP:
FORD 9N/2N ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: