The CLYMER/I&T FO-4 Manual is correct for the 9N/2N & 8N wiring. The OEM ESSENTIAL MANUALS also have the wiring diagrams. YOU need to know which one you have -the 9N/2N electrical setup is different than the 8N. Don't buy any new parts til old are verified to be defective and most major parts can be rebuilt. The 9N (after s/n 12500) and the 2N used a 1-Wire starter motor and NO Solenoid. They also used a 1-Wire/3-Brush 11 AMP B-Circuit Generator WITH the roundcan cutout circuit. The OEM Ballast resistor and Induction "loop" style AMMETER were also in the circuit. Just because you have a 6V battery don't assume it is wired for the OEM 6V/POS GRN system. Get battery tested -a charge doesn't mean it is good. Get the correct wiring diagram and go thru entire system with a VOM/Continuity Meter -NOT a test light. If you have an 8N, then you have a 3-Wire/3 brush (early) or 2-Brush (later) generator, a square Voltage Regulator, and a 3-wire starter motor with a solenoid. OEM Ballast Resistor is used on the early 8N with the front mount distributor. The later 8N with side mount does NOT use the ballast resistor. Search for Wiring Pictograms by JMOR and download a copy. Forget any lights for now -lights were never factory installed, always dealer optional accessories. Get battery tested and replaced if and only when tested bad that it won't hold a charge under load. Lastly, whatever you have, do you have a belt tensioner device on the generator? Correct fan belt tension is needed otherwise you will never charge the battery.
FORD 9N/2N WIRING 6V & 12V:
FORD N-SERIES TRACTOR FRONT MOUNT DISTRIBUTOR 9N-12250 BALLAST RESISTOR:
FORD 8N TRACTOR WIRING DIAGRAMS:
*PICTOGRAMS courtesy of JMOR
FORD 9N/2N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:
FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: