In Reply to: Starting a rebuilt engine posted by Chris Libby on April 16, 2020 at 22:22:37:
Kudos on your early 9N and restoration project. I’m posting a few 9N wiring diagrams and a LINK to my “Early 9N Generators” in case you don’t already have them. As Bruce said, get your battery verified first. Have it bench tested at your trusty local starter/alternator/generator shop or a reliable auto parts store. Don’t assume a new battery is good out the door. Don’t rely on a basic trickle charger. Verify all wiring before connecting a tested, charged good battery and applying power. Use your VOM set to continuity, not a test light. If you have an exact-as-original wiring harness, color coded wires should be the same as in the diagrams. Also, don’t assume just because you have a 6V battery it is wired correctly for the OEM POS GRN setup. It’s important to know if you have the early 9N 9N-10000-A small generator 7A, 2-Wire/2-Brush, ‘B’ circuit design with an internally grounded Field and externally sourced Field. It also uses the rectangular Voltage Regulator, not the roundcan cutout circuit. FORD soon (after s/n 12500) revised the generator to the 9N-10000-B unit, small, 7A, 1-Wire/3-Brush A-Circuit Design unit the now used the cutout. ALL 9N & 2N tractors (except the 2N warhorse) used the 1-Wire starter motor and NO solenoid. In addition, the circuit uses the OEM Ballast Resistor; the front-mount distributor; the dash-mounted push button starter switch; the dash-mounted ignition key switch; the Ignition “ON” red lamp indicator; and the 30/30 AMP (after s/n 4000) loop-style AMMETER. If you need more help, you can contact me via email –it’s open. Our MANUALS forum has scans of the original MPC’s to download too if you don’t already have them. The March, 1940 MPC was the first 9N manual.
FORD TRACTOR EARLY 9N, BEFORE S/N 12500, OEM 6V/POS GRN WIRING:
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: